Combine one cup of blueberries, sugar, water, and lemon or lime juice in a small saucepan.
Cook and stir on medium heat for 2-3 minutes until the sugar dissolves.
Bring to a boil, then reduce heat to low and simmer, uncovered for 15-20 minutes or until it begins to thicken. Stir occasionally. Blueberries may split while heating - that is okay!
Stir in remaining cup of blueberries and cook for 2-3 more minutes until blueberries become soft.
Serve warm with pancakes, waffles, crepes, ice cream, you name it!