Lillet is a French aperitif wine. It is a blend of 85% Bordeaux wines and 15% macerated liqueurs. Lillet belongs in the family of aperitif known as tonic wines. Lillet is an aperitif wine and itmust be served well chilled at 6-8Â°C or 43-46Â°F. In France it is mostly served on ice with a slice of orange, lime or lemon. In other countries Lillet is very often used as a cocktail ingredient or long drink.