1/3 c sugar
1 Tbs cornstarch
1 Tbs cold water
12 oz blueberries
1 Tbs lemon
Combine cornstarch and water in a small bowl.
Combine 6 oz blueberries & sugar in a medium saucepan over medium heat, stirring and mashing until the berries are mostly broken down. Add cornstarch and boil for one minute until thickened. Turn off heat, stir in remaining 6 oz and lemon juice.