* Depending on the size of your champagne flute, you may have extra gin, grapefruit juice and simple syrup. If so, pour it into a glass so the ice from the shaker doesn’t dilute it. Add sparkling wine to it to enjoy a second cocktail.
SIMPLE SYRUP
1 cup (8 ounces) water
1 cup granulated sugar
Bring the water to a simmer in a saucepan set over medium-high heat. Add the sugar and stir until it completely dissolves. Remove the pan from the heat. Set aside to cool to room temperature. Pour the syrup into a clean 1-pint bottle, cap it and refrigerate it until needed. Makes 1½ cups and keeps two months or longer in the refrigerator.