8 oz. fresh or frozen blueberries 3/4 cup sugar 1/2 tsp. lemon juice
1. Combine the blueberries, sugar, lemon juice, and 1/4 cup water in a 2-qt. saucepan over medium-high heat. Cook, stirring occasionally, until thickened, 8–10 minutes. Remove pan from heat and mash the blueberries with a wooden spoon until chunky; let cool. Spoon about 1 tbsp. filling into each kolache before baking.