During the last century, the Nantes winegrowers would keep back a "wedding barrel" for drinking on important occasions, a barrel which they did not rack. The wine was discovered to be more lively, more aromatic and slightly sparkling. Vinification sur lie (on the lees) is based on the same principle: the wine is matured all winter on its yeasts and draws nourishment from them. It also retains its carbon dioxinde: the resulting tiny bubbles pleasantly tickle the palate.