This recipe makes more syrup than you’ll need for 6 drinks. Use additional for extra cocktails or stir it into sparkling water or lemonade for delicious nonalcoholic drinks. Syrup keeps, covered and chilled, 3 days.
Yield:6-8 cocktails 1x
2 cups fresh blackberries
1/4 cup plus 2 tablespoons sugar
2/3 cup water
1 1/2 tablespoons finely chopped fresh rosemary
1 (750-ml) bottle Prosecco (Italian sparkling white wine), chilled
Fresh rosemary sprigs
Simmer blackberries, sugar, water, and rosemary in a small heavy saucepan, uncovered, stirring occasionally, until thickened and reduced by about two thirds, about 20 minutes.
Pour into a very fine sieve set over a glass measure and let stand 5 minutes (there will be about 1/3 cup). Discard solids (do not press on them). Chill syrup, covered, until cold.
Divide Prosecco among 6 small flutes, then pour 1 1/2 teaspoons syrup into each drink.