Easy blueberry sauce made from fresh or frozen berries that is perfectly sweet and balanced by a hint of tart lemon. It's thick and juicy, perfect for topping cakes and cheesecakes.
Cook down the blueberries. Combine blueberries, granulated sugar and lemon juice together in a small saucepan or saucier over medium heat. Cook for 5-8 minutes stirring often until the berries are thawed and they release their vibrant juices.
Mix in corn starch slurry. Mix water with cornstarch in a very small bowl. Once the berries have broken down a bit and are simmering, add the cornstarch mixture and stir it in.
Cook until thick. Continue to cook and stir until it begins to bubble and thicken. Once bubbling, cook for 15 seconds.
Cool. Immediately pour the filling into a clean bowl and let cool completely at room temperature, then refrigerate for 1 hour until thoroughly chilled and set before using. Cover and store for up to 1 week in the refrigerator.