The grapes are collected and quickly taken to the cellar where they are destemmed and delicately crushed to extract only the most noble and aromatic notes from the peel and the outer area of the berries. The must is immediately refrigerated and later it is partially fermented in autoclaves so that the carbon dioxide, which produces the lively bubbles, remains partially dissolved in the wine. Fermentation is then stopped by means of refrigeration, in order to leave approximately 140 grams of sugar per liter.