Study and careerSparkling
The ancestral method: how pét-nat is made
One fermentation, finished in the bottle: what the ancestral method is, how it differs from the traditional and tank methods, which French wines use it, and a short quiz.
Alper Billik · Advanced Sommelier
Updated October 2026 · 4 min read · Edited with AI
This article may contain affiliate links.
On this page
The short answer: in the ancestral method (*méthode ancestrale*), the wine is bottled before its first fermentation has finished. The yeast keeps working in the closed bottle, and the carbon dioxide it makes stays in the wine as bubbles. There is one fermentation only, no added sugar and yeast for a second one. Today's pét-nat (*pétillant naturel*) is made this way.
How it works, step by step
- 1. Ferment: the grape juice starts to ferment, usually kept cool so it goes slowly.
- 2. Bottle early: while there is still some natural sugar left, the wine is bottled and closed, often with a crown cap.
- 3. Finish in the bottle: fermentation goes on; the CO2 has nowhere to go, so the wine becomes sparkling, and dead yeast (lees) settles as sediment.
- 4. Disgorge, or not: some producers remove the sediment (disgorging) for a clear wine; many pét-nats are left cloudy.
Because the winemaker cannot add sugar or control the pressure precisely, results vary: some bottles are gently fizzy, some lively; some dry, some with a little sweetness left. That is the charm, and the risk.
Ancestral, traditional, tank: the difference
| Method | Where the bubbles come from | Examples |
|---|---|---|
| Ancestral | The first and only fermentation, finished in the bottle | Pét-nat, Limoux méthode ancestrale, Bugey Cerdon |
| Dioise | Like ancestral, then the wine is filtered and rebottled under pressure | Clairette de Die Méthode Dioise Ancestrale |
| Traditional | A second fermentation in the bottle, after adding sugar and yeast; aged on lees, then disgorged | Champagne, Cava, Crémant, Franciacorta |
| Tank (Charmat) | A second fermentation in a sealed tank, then bottled under pressure | Prosecco, Asti |
- Ancestral
- Where the bubbles come fromThe first and only fermentation, finished in the bottle
- ExamplesPét-nat, Limoux méthode ancestrale, Bugey Cerdon
- Dioise
- Where the bubbles come fromLike ancestral, then the wine is filtered and rebottled under pressure
- ExamplesClairette de Die Méthode Dioise Ancestrale
- Traditional
- Where the bubbles come fromA second fermentation in the bottle, after adding sugar and yeast; aged on lees, then disgorged
- ExamplesChampagne, Cava, Crémant, Franciacorta
- Tank (Charmat)
- Where the bubbles come fromA second fermentation in a sealed tank, then bottled under pressure
- ExamplesProsecco, Asti
Where the ancestral method is the law
In France, the term *méthode ancestrale* is written into the rules of four appellations: Limoux, Gaillac, Bugey Cerdon and Clairette de Die. Outside those, anyone can use it, which is why pét-nat is made around the world.
- Limoux (Languedoc): Blanquette de Limoux méthode ancestrale, from Mauzac; apple-scented, softly sweet.
- Gaillac (south-west France): méthode ancestrale, also from Mauzac.
- Bugey Cerdon (near Savoie): a pink, off-dry sparkling wine from Gamay and Poulsard.
- Clairette de Die (Rhône, Drôme): made by the méthode dioise, mainly from Muscat; grapey, sweet and low in alcohol.
What pét-nat tastes like
Fresh, fruity and gently fizzy, often cloudy, sometimes with a yeasty, cidery edge. It can be made from any grape, white, rosé or red. Serve it well chilled, open it carefully (some bottles foam), and drink it young. For the feeling of it, read pét-nat is still the coolest kid in the room.
Quick quiz: the ancestral method
Level 1 practice test
Take it as a real test
6 questions, one at a time. The answer and why after each one, then your score and your weakest topics.
Question 1
In the ancestral method, how many fermentations make the wine?
- a)One
- b)Two
- c)Three
- d)None
Show answerAnswer
a) One. The first fermentation finishes in the bottle.
Question 2
Which method uses a second fermentation in a sealed tank?
- a)Ancestral
- b)Traditional
- c)Charmat
- d)Dioise
Show answerAnswer
c) Charmat. The Charmat or tank method, used for Prosecco.
Question 3
Which grape is the base of Limoux méthode ancestrale?
- a)Chardonnay
- b)Mauzac
- c)Chenin Blanc
- d)Muscat
Show answerAnswer
b) Mauzac. Mauzac, the old grape of Limoux and Gaillac.
Question 4
Bugey Cerdon is made mainly from...
- a)Pinot Noir and Chardonnay
- b)Gamay and Poulsard
- c)Mauzac
- d)Glera
Show answerAnswer
b) Gamay and Poulsard. A pink, off-dry ancestral sparkling wine.
Question 5
What does pét-nat stand for?
- a)Petit naturel
- b)Pétillant naturel
- c)Pétillant nature
- d)Petite nature
Show answerAnswer
b) Pétillant naturel. French for 'naturally sparkling'.
Question 6
Which wine is made by the méthode dioise?
- a)Crémant de Loire
- b)Clairette de Die
- c)Cava
- d)Asti
Show answerAnswer
b) Clairette de Die. Clairette de Die Méthode Dioise Ancestrale.
Next, the rest of the sparkling world: sparkling wine for Level 1, then the sparkling wine quiz. For daily questions, SOMM DIGI AI has 3,000+ exam-prep questions, free to start.
Questions people ask
Is pét-nat the same as the ancestral method?
Pét-nat is the modern name for wine made by the ancestral method: bottled before the first fermentation ends.
Is ancestral-method wine sweet?
It can be. The sugar left at bottling may not all ferment, so some are off-dry, such as Bugey Cerdon and Clairette de Die. Many pét-nats are dry.
Why is pét-nat cloudy?
The yeast sediment from fermentation is often left in the bottle instead of being disgorged.
How is the ancestral method different from Champagne?
Champagne has two fermentations: a still base wine, then a second in the bottle after adding sugar and yeast. The ancestral method has only one.
Your exam kit
Where to study for your exam
My book · AmazonSommelier Level 1 Prep BookLevel 1's key topics in one small book you can carry anywhere.Order on Amazon 
My book · AmazonSommelier Prep BookQuick questions and answers for a break at work.Order on Amazon SOMM DIGI built the Court of Master Sommeliers Europe’s Learning Portal, and SOMM DIGI AI. Who is behind this
For sommeliers · next steps