Ingredients

Serves 6

　　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

　　Garnishes: fresh rosemary sprigs and blackberries

　　

Step 1

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.

　　

Step 2

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.

　　

Step 3

Divide Prosecco among 6 small flutes, then pour 1 1/2 teaspoons syrup into each drink.

　　Cooks' notes:

　　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.