Vermouth And Cassis is thirst quenching weak cocktail at 0.4 standard drinks. Layered with 30ml vermouth dry causes and cures and 15ml blackcurrant liqueur white heron with 45ml soda water as well as 100ml ice and best with lunch. Just pack ice cubes into glass then add in the dry vermouth, and pour in the soda water. Sprinkle blackcurrant Liqueur on top and served in a old fashioned glass cold.