The grapes undergo strict quality control - selected, then softly pressed; the wort is defended in a cold state, ground, then fermented at a controlled temperature. In the spring, a selection of the best base wines from the previous harvest is added to the new wine, as well as a mixture of sugar and cultured yeast; it is then bottled and re-fermented. After 32 months of fermentation and maturation, the wine is disgorged and then poured with liqueur d'expedition. After additional aging for at least 3 months, the wine is released.