- 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
- 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.