-Frozen Blueberries -Sugar -Lemon -Corn Starch -Water
Place a medium-sized pot over medium heat. Add frozen blueberries, sugar, and water. Stir to incorporate.
While the blueberries come to a sputtering boil, use a vegetable peeler to zest the lemon in strips. Then juice the lemon.
It will take about 7 to 10 minutes for the blueberry mixture to come to a sputtering boil. Once that happens, use a fork to mash the blueberries against the walls of the pan.
Add lemon juice and the lemon zest to the pan. Stir to incorporate. In a separate bowl, mix the tablespoon of cornstarch into the remaining water, until it is completely dissolved. Add the cornstarch slurry to the pan and stir until it is fully mixed in.
Continue to stir the blueberry sauce until the syrup coats the back of a spoon. This will take about 3 to 5 minutes. When you drag your finger over the back of the spoon, it should leave a mark that the syrup does not seep back into. Take the sauce off the heat, allow it to cool. The sauce will thicken as it cools. Enjoy!