Sparkling wine is wine that has been fermented a second time. In Champagne that second fermentation happens inside the same bottle that ends up on your table. That is the méthode champenoise, legally renamed méthode traditionnelle outside the Champagne AOC. The steps:
1. Pressing (pressurage)
Grapes are pressed gently right after harvest. The first 2,050 litres per 4,000 kg (one “marc”) are called cuvée, fine and acidic. The next 500 litres are the taille, fuller and slightly more coloured. Many growers use cuvée only; large houses blend both.
2. First fermentation (vinification)
The must ferments into a still base wine of around 10.5 percent alcohol, dry and high in acid. Fermenting in oak versus stainless steel is a house decision: oak adds texture, steel keeps fruit pure. Some houses encourage malolactic fermentation (softer), others block it (fresher, sharper). Krug and Bollinger are classic oak houses.
3. Blending (assemblage)
The winemaker blends base wines across plots, grapes and years (for non-vintage). Reserve wines from earlier vintages keep the house style consistent. A major NV cuvée can contain hundreds of base wines.
4. Tirage and bottling
The assemblage goes into the bottle with the liqueur de tirage, a mix of sugar, yeast and a clarifying aid. Sugar plus yeast means a second fermentation. Standard dosage produces about six bars of pressure, comparable to a double-decker tyre.
5. Second fermentation and autolysis
The yeasts convert sugar into alcohol and CO₂. After they die they slowly break down. That is autolysis. Autolysis, not the second fermentation, is what gives Champagne its complexity: brioche, hazelnut, toast, creamy texture. The legal minimum is twelve months for non-vintage, three years for vintage. Good houses go longer.
Source: Comité Champagne, production process.
6. Riddling (remuage)
The bottle is gradually turned and tilted from horizontal to almost upside down. Goal: the dead yeast (sediment) collects in the neck. Originally manual, in wooden pupitres (the invention is usually credited to Veuve Clicquot, 1816), today mostly in mechanised gyropalettes.
7. Disgorgement
The neck is frozen in a brine bath. The crown cap comes off, the frozen plug shoots out under internal pressure. Result: clear wine in the bottle, no additives yet.
8. Dosage and liqueur d’expédition
After dégorgement the bottle is slightly under-full. The liqueur d’expédition, a mix of wine and sugar, tops it up and defines the final style. Brut Nature gets none, Brut up to 12 g/l, Demi-Sec up to 50 g/l. Then cork, cage, label, rest.
What this means for you
Méthode champenoise with long autolysis is more expensive and more complex than tank-method (Prosecco) or méthode ancestrale (Pet-Nat). You are paying for cellar time, not only for grapes. A non-vintage that spent 24 months on the lees tastes fundamentally different from one that spent the legal minimum of twelve. Always ask your wine merchant how long a bottle lay on its lees.
Frequently asked questions
What is the méthode champenoise?
The production method behind champagne: a still base wine gets sugar and yeast in the bottle, where a second fermentation creates the bubbles. The process runs through eight steps, from pressing to dosage, and legally takes at least twelve months for non-vintage and three years for vintage.
What is autolysis?
The ageing of the wine on its spent yeast cells after the second fermentation. That is where the brioche and bread aromas come from. A non-vintage with 24 months of autolysis tastes fundamentally different from a bottle that got the legal minimum of twelve months.
What happens during riddling?
The bottles are turned and tilted step by step so the yeast sediment slides into the neck. It used to be done by hand in pupitres (the invention is usually credited to Veuve Clicquot, 1816); today gyropalettes do most of it mechanically. Disgorgement then removes the sediment.
What is dosage?
The final step: a mix of wine and sugar (the liqueur d’expédition) tops up the bottle after disgorgement. Brut Nature gets no sugar, Brut a maximum of 12 g/l, Demi-Sec up to 50 g/l. The dosage sets the final sweetness.
What does cuvée mean at pressing?
The first 2,050 litres of must per 4,000 kilos of grapes (one “marc”): fine and high in acid. The next 500 litres is called the taille, fuller and more coloured.