Definition - What does Extra Brut mean?
Extra brut is the term used to describe the driest type of champagne or sparkling wine. In order to qualify as extra brut, the wine must have no more than 6g/L of residual sugar. It is sometimes referred to as brut nature, because brut wine is made without any addition of sugar, thereby making it dry. Extra brut wines are dry and lack sweetness in taste.
WineFrog explains Extra Brut
Extra brut wine's production with a bare