2 cups blackberries (fresh or frozen)
1/4 cup plus 2 Tbsp sugar (3/8 cup)
2/3 cup water
1 1/2 Tbsp finely chopped fresh rosemary
To serve: club soda or sparkling white wine
Combine blackberries, sugar, water, and rosemary in a small, heavy saucepan. Bring to a boil and then turn heat down. Simmer uncovered for 30 minutes, stirring occasionally, until mixture has thickened and reduced by about half.
Pour into a fine sieve set over a bowl or whatever container of holding you’re using. Let stand about five mintues- do not press on solids. Cover and store for up to a week.
To serve: Pour 1-2 Tbsp into the bottom of a glass, add ice, and fill with club soda. Or omit the ice, and fill with sparkling white wine. Stir and enjoy.