Lees are deposits of dead yeast or residual yeast and other particles that precipitate, or are carried by the action of " fining", to the bottom of a vat of wine after fermentation and

aging Ageing ( BE) or aging ( AE) is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. I ...

. The same while brewing beer at a brewery is known as

trub Trub is one of the largest municipalities of Switzerland (62 km²) in size, but not in population. It is located in the Emmental region of the canton of Bern in the administrative district of Emmental. History Trub is first mentioned in ...

– the same from secondary fermentation of wine and beer are the lees or equally, as to beer only, dregs. This material is the source for most commercial

tartaric acid Tartaric acid is a white, crystalline organic acid that occurs naturally in many fruits, most notably in grapes, but also in bananas, tamarinds, and citrus. Its salt, potassium bitartrate, commonly known as cream of tartar, develops naturally ...

, which is used in cooking and in organic chemistry. Normally, the wine is transferred to another container (

racking Racking, often referred to as Soutirage or Soutirage traditionnel (meaning racking in French), also filtering or fining, is the process of moving wine or beer from one container to another using gravity rather than a pump, which can be disruptiv ...

), leaving this sediment behind. Some wines (notably

Chardonnay Chardonnay (, , ) is a green-skinned grape variety used in the production of white wine. The variety originated in the Burgundy wine region of eastern France, but is now grown wherever wine is produced, from England to New Zealand. For ne ...

Champagne Champagne (, ) is a sparkling wine originated and produced in the Champagne wine region of France under the rules of the appellation, that demand specific vineyard practices, sourcing of grapes exclusively from designated places within it, sp ...

, and

Muscadet Muscadet ( , , ) is a French white wine. It is made at the western end of the Loire Valley, near the city of Nantes in the Pays de la Loire region. It is made from the Melon de Bourgogne grape, often referred to simply as ''melon''. While mo ...

) are sometimes aged for a time on the lees (a process known as ''

sur lie Lees are deposits of dead yeast or residual yeast and other particles that precipitate, or are carried by the action of " fining", to the bottom of a vat of wine after fermentation and aging. The same while brewing beer at a brewery is known as ...

''), leading to a distinctive yeasty aroma and taste. The lees may be stirred (french: bâtonnage) for uptake of their flavour. The lees are an important component in the making of ''

ripasso Valpolicella (, , ) is a viticultural zone of the province of Verona, Italy, east of Lake Garda. The hilly agricultural and marble-quarrying region of small holdings north of the Adige is famous for wine production. Valpolicella ranks just after ...

'', where the leftover lees from

Amarone Amarone della Valpolicella, usually known as Amarone (, ), is an Italian DOCG denomination of typically rich dry red wine made from the partially dried grapes of the Corvina (45–95%, of which up to 50% could be substituted with Corvinone), ...

are used to impart more flavour and colour to partially aged

Valpolicella Valpolicella (, , ) is a viticultural zone of the province of Verona, Italy, east of Lake Garda. The hilly agricultural and marble-quarrying region of small holdings north of the Adige is famous for wine production. Valpolicella ranks just after ...

Fujian red wine chicken Fujian red wine chicken () is a traditional dish of northern Fujian cuisine which is made from braising chicken in wine lees made from red yeast rice (see lees (fermentation) ). This dish is traditionally served to celebrate birthdays and served ...

is made from rice wine lees.

''Sur lie''

''Sur lie'' literally translates from French as 'on lees'. ''Sur lie'' wines are bottled directly from the lees without racking (a process for filtering the wine). In the case of great Chardonnay, such as

Montrachet ''For the restaurant, see Montrachet (restaurant)'' Montrachet (pronounced ''Mon-rashay''; ) is an ''Appellation d'origine contrôlée'' (AOC) and Grand Cru vineyard for white wine made of Chardonnay in the Côte de Beaune subregion of Burgundy ...

, this adds a toasty, nutty "hazelnut" quality and additional depth and complexity. Chemically, this can alter the oak flavour molecules, increasing the integration, and making the oak seem less obtrusive to the palate. This is desirable because oak tannins are polyphenolic acids, and can be harsh. This process can also give an added freshness and creaminess to the wine, and improve

color Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associa ...

and clarity. Muscadet is made in this fashion. The effect of the lees during bottle fermentation for at least 18 months on Champagne is considerable. The "bready" toasty notes associated with some of the greatest sparkling wines made are the result of ''sur lie'' aging.

Other uses

Beer on an element of lees (residual sediment) is also sold, such as many * Trappist beers *

Unibroue Unibroue is a brewery in Chambly, Quebec, Canada, that was started by Serge Racine and Quebec native André Dion. The company was purchased by Sleeman Breweries Ltd. in 2004, which was itself taken over by Sapporo in 2006. The company was incor ...

Quebec, Canada Quebec ( ; )According to the Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is one of the thirteen ...

-based ales/beers *

Real ale Real ale is the name coined by the Campaign for Real Ale (CAMRA) for beer that is "brewed from traditional ingredients, matured by secondary fermentation in the container from which it is dispensed, and served without the use of extraneous car ...

s of older styles (not India Pale Ale)

Kombucha Kombucha (also tea mushroom, tea fungus, or Manchurian mushroom when referring to the culture; Latin name ''Medusomyces gisevii'') is a fermented, lightly effervescent, sweetened black tea drink commonly consumed for its purported health be ...

can also be brewed ''sur lie''.

Light lees protocol

In a process in which yeast is added to wine that has completed primary fermentation, this secondary yeast addition typically remains in the wine from 2–8 weeks, depending on the winemaker's goals. The yeast is stirred (''bâtonage'') frequently, and racked when the protocol is complete. Also known as secondary autolysis, a light lees protocol releases additional mannoproteins and polysaccharides that can influence the flavour, tannins, and acidity of the wine.

References

{{Reflist Fermentation in food processing Winemaking Yeasts it:Feccia (enologia)