Pét-nat, or Méthode Ancestrale, is a method of sparkling wine production used all over the world. Unlike traditional-method sparkling wines, like Champagne, which add sugar and yeast to dry, still wine in order trigger a second fermentation and produce bubbles, pét-nat works by bottling wine that is only partially fermented.
As the first and only fermentation continues in bottle, the resulting carbon dioxide (CO2) is trapped. After a period of rest that can be as short as a couple of months, the gas is absorbed into the wine as bubbles and the pét-nat is ready to drink.
Serve as cold as possible!