1 pound fresh or frozen blueberries
1/2 cup sugar
3 teaspoons fresh lemon juice
2 teaspoons cornstarch
1 1/2 teaspoons grated lemon peel
Combine all ingredients in a heavy medium saucepan. Stir over medium heat until cornstarch dissolves.
Boil until thickened, stirring occasionally, about 4 minutes. Cover and refrigerate until cold. ( can be made 3 days ahead; keep chilled.