Let's get started!
This recipe works equally well with fresh or frozen blueberries.
cornstarch
sugar
blueberries
water
lemon juice
butter
Combine cold water and cornstarch in a pot and cook.
Add the blueberries and let it low boil until the blueberries burst. Add the butter at the end.
Swap the blueberries with strawberries to make a strawberry sauce variation.