This fresh blueberry cake filling tastes AMAZING! Spread it between two layers of cake, use it as a pie filling, or use it as a topping for yummy cupcakes.
Whisk cornstarch with 2 tablespoons of water together in a small bowl and set it aside.
In a saucepan, add blueberries and butter over medium heat and cook for 1 minute, then add the sugar, water, and salt to the pan and stir them together.
Pour the cornstarch mixture into the pan and cook on medium heat for 2-3 minutes until the mixture begins to bubble and thicken.
Remove from the heat and add the lemon juice and zest.
Notes
This recipe yields about 4 cups of filling, perfect for stuffing a 22cm two-layer cake or making a 22cm pie.