Sour & wild
Fruit lambic
Lambic refermented on whole fruit — traditionally sour cherry or raspberry — producing a dry, tart, intensely fruity beer.
- Strength
- 5–7% ABV
- Bitterness
- 0–10 IBU
- Colour
- Deep red to pink, depending on fruit
- Serve at
- 8–12°C
Also known as kriek, framboise, oude kriek.
Whole fruit is added to mature lambic and refermented, so its sugars are consumed. Traditional versions are therefore dry rather than sweet, with the fruit contributing acidity, tannin and aroma rather than sweetness.
Many commercial products sold under these names are sweetened, often heavily, and are a different drink from a traditional oude kriek. The word "oude" on the label is the reliable signal.
The fruit should read as the fruit, not as sweetness. Traditional examples ferment the sugar out entirely, leaving cherry or raspberry as aroma and acidity over a bone-dry base — startlingly different from the sweetened commercial versions most people meet first. Both exist and only one is traditional, so it is worth checking whether a beer is kriek in the old sense before judging the style on it.
Questions this page answers
- what does fruit lambic taste like — How it tastes
- fruit lambic abv — Measurements
- fruit lambic food pairing — What to eat with it
- fruit lambic serving temperature — Serving
- how long does fruit lambic last — Freshness and storage
- styles similar to fruit lambic — If you like this, try
- how to brew fruit lambic — How it is made
- what beer is an example of fruit lambic — Beers to try
- is astringency normal in fruit lambic — Characteristics that may be expected here
How it tastes
BeerHQ’s own comparative scale, not a measurement. Each bar is a range because a style is a span of real beers rather than one beer.
Appearance and character
| Colour | Deep red to pink, depending on fruit |
|---|---|
| Clarity | slight haze |
| Head | Pink-tinged, large |
| Fermentation | Spontaneous. Inoculated by ambient microflora rather than pitched culture, traditionally via a coolship, then matured in wood. |
| Origin | Belgium — Pajottenland |
| Tradition | Belgian spontaneous fermentation |
Measurements
Conventional ranges published by style bodies, not a specification. IBU measures iso-alpha acids in a lab and does not track perceived bitterness — compare it against the sensory scale above rather than reading it as a flavour rating.
| Measurement | Typical range |
|---|---|
| ABV | 5–7% ABV |
| IBU | 0–10 IBU |
| Colour | Deep red to pink, depending on fruit — 5–25 SRM, 10–49 EBC. That is a wide range: two examples of this style can look plainly different from each other in the glass. The swatch above will not match what you see. SRM measures how much light a beer absorbs, not what colour it is, and it has no way to express the red this style carries. |
| Original gravity | 1.040–1.060 |
| Final gravity | 1.000–1.010 |
| Carbonation | 3–4 vol CO₂ |
Classified by BJCP-2021 as Fruit Lambic (exact fit). BeerHQ maintains its own taxonomy and records how it maps onto others rather than adopting any one of them.
What goes into it
| Malt | Pilsner malt, Torrified wheat |
|---|---|
| Yeast | Spontaneous fermentation, Brettanomyces |
Serving
| Temperature | 8–12°C |
|---|---|
| Glass | Flute, Tulip glass |
| Dispense | Bottle conditioned — Beer refermented in the bottle with added yeast and sugar, producing natural carbonation and excellent ageing potential. |
Freshness and storage
Fruit lambic is typically at its best 6–60 months after packaging, and time is working for it rather than against it.
Needs age. Time is part of how this beer is made. Young examples are not a lesser version of the same thing — they are unfinished.
- The culture is still working in the package, so time is part of how the beer is made rather than something it merely survives.
- Bottle-conditioned, so live yeast continues to scavenge oxygen and the beer is more forgiving of time than an equivalent filtered version.
What changes with time
- Oxidation. Reaction with oxygen, producing wet cardboard and sherry notes in pale beer and dark-fruit depth in strong dark beer. Months to years, depending on packaged oxygen and temperature.
- Maturation. Intended change that continues after packaging and makes the beer better rather than worse. Weeks to years, depending on the culture and the style.
- Deliberate ageing. Keeping a beer on purpose, accepting some oxidation because of what it develops in return. One to ten years for suitable styles. Most beer is not suitable.
- Staling. The general, gradual loss of freshness that affects all beer, accelerated sharply by warmth. Months, and roughly twice as fast for every 10 °C warmer.
In the package
- Brown glass bottle — Live yeast in the package continues to scavenge oxygen, which slows staling and builds condition.
Old beer tastes worse; it does not become dangerous. Ethanol, low pH, hop compounds and the absence of oxygen make packaged beer hostile to the organisms that cause foodborne illness. The exception is a compromised package — visible mould at the closure, a pierced or rusted can, a lifted cap — which is a reason to discard the beer regardless of its age.
Guidance, not an expiry date. How a beer is stored matters more than the date printed on it, and staling roughly doubles in rate for every 10 °C. See storage and freshness for the full model.
What to eat with it
- Cheesecake
Sharp fruit acidity against dense, fatty sweetness — the beer equivalent of the fruit compote a cheesecake is usually served with, and considerably drier.
- Lemon tart
A dessert whose problem is acidity rather than sweetness, which inverts the usual advice. Putting a beer with its own fruit and sharpness beside it means the two sit on the same side; a rich stout, the reflex answer for pudding, argues with the citrus instead.
- Pavlova
Meringue is close to pure sugar and the fruit is there to make it bearable — the dessert is already playing the trick a beer would otherwise have to play. Joining the fruit rather than the sugar puts the beer on the side that is winning, which is the same move a lemon tart wants.
- Dim sum
Bitterness, carbonation and a dry finish scrub the fat off the palate, so each mouthful of food tastes as good as the first.
- Feta
Bitterness, carbonation and a dry finish scrub the fat off the palate, so each mouthful of food tastes as good as the first.
- Goat's cheese
Bitterness, carbonation and a dry finish scrub the fat off the palate, so each mouthful of food tastes as good as the first.
Beers to try
Widely-known examples BeerHQ carries as reference points for this style. Not a recommendation list and not ranked — these are the beers that make the category concrete.
If you like this, try
Gueuze
The unfruited blended equivalent.
Suits you if: You like Fruit lambic but want less berry. Reason not to: Noticeably less berry than Fruit lambic, which may make it feel thin by comparison.
Lambic
The base beer.
Suits you if: You like Fruit lambic but want less carbonation. Reason not to: Noticeably less carbonation than Fruit lambic, which may make it feel thin by comparison.
American wild ale
Same family — both are Sour & wild beers.
Suits you if: You like Fruit lambic but want more yeast fruitiness (esters). Reason not to: Noticeably more yeast fruitiness (esters) than Fruit lambic, which not everyone wants.
Flanders red ale
Same family — both are Sour & wild beers.
Suits you if: You like Fruit lambic but want more yeast fruitiness (esters). Reason not to: Noticeably more yeast fruitiness (esters) than Fruit lambic, which not everyone wants.
Berliner Weisse
Same family — both are Sour & wild beers.
Suits you if: You like Fruit lambic but want less berry. Reason not to: Noticeably less berry than Fruit lambic, which may make it feel thin by comparison.
Compare with
- Fruit lambic vs Gueuze — The main difference is yeast fruitiness (esters): Gueuze has far more of it than Fruit lambic. Fruit lambic also leads on berry; Gueuze on phenolic spice and citrus.
- Fruit lambic vs Lambic — The main difference is phenolic spice: Lambic has noticeably more of it than Fruit lambic. Fruit lambic also leads on carbonation and berry; Lambic on yeast fruitiness (esters).
- Fruit lambic vs Oud Bruin — The main difference is dryness: Fruit lambic has far more of it than Oud Bruin. Oud Bruin also leads on malt intensity, yeast fruitiness (esters) and caramel & toffee.
- Fruit lambic vs Flanders red ale — The main difference is yeast fruitiness (esters): Flanders red ale has far more of it than Fruit lambic. Fruit lambic also leads on stone fruit; Flanders red ale on caramel & toffee and bitterness.
Characteristics that may be expected here
Each of these is treated as a fault in most beer, and in this style it can be part of the character. Intensity and context decide which: a trace that suits the style and an obvious, dominating version of the same thing are not the same finding. Follow the link where you want to work out which one you have.
Astringency
A degree of tannic grip is expected where whole fruit or long oak contact is involved, and it contributes structure much as it does in wine. Harsh, drying astringency in a conventional beer is a fault.
Faults to watch for
- Gushing — Beer that erupts on opening, caused either by refermentation in the package or by fungal proteins from mould-affected barley.
- Acetic acid — Vinegar character produced by acetic acid bacteria, which need oxygen — so it always points to air ingress.
- Mousy taint — An unpleasant taint of mixed-fermentation beer, characteristically tasted rather than smelled and arriving late on the finish.
How it got here
Fruit lambic does not have a separate history of its own. It is a reading of Lambic, and that is where the account belongs — repeating it here would be a second copy of one story.
How it is made
The steps that shape this style in particular, rather than the ones every beer goes through.
- Mixed fermentation — Ferment with a deliberately chosen combination of organisms — Saccharomyces with Brettanomyces, Lactobacillus and/or Pediococcus — over months or years.
- Spontaneous fermentation — Allow ambient microorganisms to inoculate cooling wort rather than pitching a culture, producing lambic and its derivatives.
- Turbid mashing — Run a deliberately inefficient traditional lambic mash that leaves starch and dextrin unconverted, providing long-term food for Brettanomyces.
- Kettle souring — Sour wort with Lactobacillus before the boil, then boil to kill the bacteria and ferment clean — producing lactic acidity in days rather than years.
- Bottle conditioning — Carbonate beer through a secondary fermentation inside the sealed bottle, using residual or freshly-added yeast with priming sugar.
- Barrel ageing — Mature beer in wooden barrels for the wood and spirit character they contribute, or for the microflora they harbour and the slow oxygen exchange they allow.
- Blending — Combine beers of different ages or batches to produce a consistent or more complex result than any single batch would give.
Sensory levels are BeerHQ’s editorial abstraction, described as None–Very high on a six-point scale. Measurements are conventional style ranges. Last reviewed 2026-08-15.
Evidence
What BeerHQ knows about this, and how. Every statement carries the state of the evidence behind it rather than being presented flatly as fact.
On Mousy taint
Which organism is chiefly responsible for mousiness is unsettled. Brettanomyces bruxellensis is the species most commonly named, and recent work points instead at heterofermentative lactic acid bacteria, with a chemical route in the beverage itself also proposed.
— Brettanomyces bruxellensis is the organism most consistently associated with mousy off-flavour in fermented beverages, and a pathway from L-lysine through Δ-piperideine to 2-acetyltetrahydropyridine is described for it.
— A recent study reported that mousy off-flavour in wine is mostly produced by the heterofermentative lactic acid bacteria Lentilactobacillus hilgardii and Oenococcus oeni, or chemically in the matrix, and that Brettanomyces bruxellensis had minimal impact.
— The compounds can also form through Maillard chemistry during kilning and boiling, without any organism producing them.
The review states plainly that many factors in N-heterocycle formation are not well understood, and it carries both microbial accounts without resolving them. Naming one organism would make the fault page look more diagnostic than the field is, and would point a brewer at the wrong control.
Genuinely contested Credible sources disagree, so both positions are given rather than one.
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), section 4.2, microbial diversity and pathways (J Agric Food Chem 72(14):7618–7628)
On Bottle conditioning
Whether naturally conditioned beer has a perceptibly finer carbonation than force-carbonated beer at the same level is disputed; what is not disputed is that bottle-conditioned beer contains live yeast that continues to scavenge oxygen.
— Widely repeated trade and enthusiast position that secondary fermentation produces smaller, finer bubbles and a softer mouthfeel.
— Carbonation level and dispense conditions determine bubble behaviour, and no controlled work establishes a difference attributable to the carbonation route itself at matched volumes.
BeerHQ separates the contested sensory claim from the uncontested functional one: live yeast measurably slows staling regardless of whether the bubbles differ.
Genuinely contested Credible sources disagree, so both positions are given rather than one.
Sources: Brewing: Science and Practice — print; Campaign for Real Ale
On Astringency
Astringency is a tactile sensation caused by polyphenols binding salivary proteins, and is distinct from bitterness, which is a taste detected by chemoreceptors rather than felt.
Backed by a source
Sources: Beer: Tap into the Art and Science of Brewing — print; Tasting Beer (2nd edition) — print
On Astringency
Tannin extraction from grain husks rises sharply when sparge water is too hot, too alkaline or continued to very low runnings gravity, which is why brewers stop sparging at a target gravity rather than rinsing the bed dry.
Backed by a source
Sources: How to Brew (4th edition) — print; Brewing: Science and Practice — print
On Brettanomyces
Brettanomyces is a specific genus routinely pitched as a pure culture, so its presence indicates neither a spontaneous fermentation nor an accident — the common description of it as "wild yeast" conflates the organism with a method.
Backed by a source
Sources: Yeast: The Practical Guide to Beer Fermentation — print; The Oxford Companion to Beer — print
On Brettanomyces
Brettanomyces can consume long-chain carbohydrates that Saccharomyces cannot, which is why a mixed or spontaneous fermentation keeps developing for years after ordinary fermentation would have finished.
Backed by a source
Sources: Yeast: The Practical Guide to Beer Fermentation — print; Journal of the Institute of Brewing
On Tulip glass
An inward-curving rim concentrates volatile aromatics in the headspace above the beer, which is a real and measurable effect and the only glassware mechanism with a straightforward physical basis.
Backed by a source
Sources: Tasting Beer (2nd edition) — print; Institute of Brewing & Distilling technical publications
On Gushing
Gushing-inducing hydrophobins are surface-active proteins that most filamentous fungi produce to grow across a liquid-air interface, and they reach the brewhouse when excessive fungal growth occurs on the grain either before harvest or in storage.
Checked against the source
Source: Bokulich & Bamforth, "The Microbiology of Malting and Brewing" (2013), Barley (Microbiol Mol Biol Rev 77(2):157–172)
On Gushing
Gushing has two unrelated causes: excess package pressure from continued fermentation, and hydrophobin proteins produced by Fusarium mould on barley in the field, which survive the entire brewing process.
Backed by a source
Sources: Brewing: Science and Practice — print; Journal of the Institute of Brewing
On Acetic acid
Lactic acid reads as clean and yoghurt-like while acetic acid reads as sharp and vinegary, which is why a gose and a Flanders red are both sour but do not taste alike, and why acetic character in a cask ale indicates air ingress rather than intent.
Backed by a source
Sources: Tasting Beer (2nd edition) — print; The Oxford Companion to Beer — print
On Mousy taint
How much of these compounds is actually present in beer is not well established. Published measurements in beer are scarce, and the concentrations most often quoted come from spoiled wine.
Checked against the source
Sources: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), section 3 (J Agric Food Chem 72(14):7618–7628); Martusevice et al., "Analysis of mousy off-flavor compound 2-Acetyl-tetrahydropyridine using LC-MS with ESI in sour beer" (2024), abstract (MethodsX 12:102643)
On Mousy taint
The mousy character is not one compound but a group of nitrogen heterocycles — chiefly 2-acetyltetrahydropyridine, 2-acetyl-1-pyrroline and 2-ethyltetrahydropyridine — described in the literature as smelling of mouse urine, cereal, corn tortilla chips or freshly baked sour bread.
Checked against the source
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), abstract and section 3 (J Agric Food Chem 72(14):7618–7628)
On Mousy taint
The three compounds differ enormously in potency: reported thresholds in water are about 1.6 µg/kg for 2-acetyltetrahydropyridine and about 150 µg/kg for 2-ethyltetrahydropyridine, while 2-acetyl-1-pyrroline is reported at 0.06–0.1 µg/kg by orthonasal assessment.
Checked against the source
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), section 3 (J Agric Food Chem 72(14):7618–7628)
On Mousy taint
Sour and fruited sour beers are reported as more prone to mousiness where oxygen and divalent iron are elevated, and the risk is described as concentrated in the later stages — extended cask and barrel maturation rather than primary fermentation.
Checked against the source
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), sections 4.1 and 4.2 (J Agric Food Chem 72(14):7618–7628)
On Mousy taint
Not every appearance of these compounds is treated as a defect: some brewers deliberately encourage 2-ethyltetrahydropyridine as an aftertaste component in mixed-culture beer.
Checked against the source
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), section 3 (J Agric Food Chem 72(14):7618–7628)
On Mousy taint
Mousiness is characteristically tasted rather than smelled, and arrives late: the compounds are only weakly volatile at beer’s acidity, and saliva — which is close to neutral — raises the pH in the mouth enough to shift them to a more volatile form that then reaches the olfactory receptors from behind.
Checked against the source
Source: Martusevice et al., "A Review of N-Heterocycles: Mousy Off-Flavor in Sour Beer" (2024), section 3, perception of ATHP, ETHP and APY (J Agric Food Chem 72(14):7618–7628)
On Blending
London porter brewing routinely blended aged, lightly-soured stock beer with fresh beer, so a degree of Brettanomyces and lactic character was a normal part of the style rather than a fault.
Backed by a source
Sources: Historical brewing log transcriptions and analysis; Beer: The Story of the Pint — print