In a medium saucepan, add ½ cup granulated sugar, 1 tablespoon cornstarch, ½ cup water, and 1 tablespoon lemon juice and whisk. Bring to a gentile boil over medium-high heat and add the 2 cups fresh blueberries*.
Reduce the heat to low and simmer for 4-5 minutes until the blueberries burst and the syrup starts to thicken. Remove from heat and serve.