This dressed up champagne is given its beautiful color and flavor with Creme de Cassis, a dark red liqueur made from black currants. Tradition dictates serving this cocktail in a tall champagne flute rather than a coupe, to appreciate its dramatic color.
In a chilled Champagne flute, pour in the Crème de Cassis. Pour the just-opened Champagne or sparkling wine on top.
Garnish with a lemon twist and two frozen berries. Serve immediately.