2 1/2 c. blueberries (fresh or frozen, without juice)
1/3 c. sugar
1/2 c. orange juice
1 Tbl. cornstarch
2 tsp. lemon juice
Combine blueberries, sugar, and 1/4 c. of orange juice in a saucepan. Warm the mixture, stirring occasionally. While the berries heat, mix the cornstarch into the remaining orange juice. Bring the sauce to a boil and add cornstarch mixture. Cook the sauce at a low boil for 1 minute, stirring constantly. Remove from heat and stir in lemon juice. Cool for about 5 minutes before serving.