In a small saucepan, add blueberries, ½ cup water, and 2 Tbsp sugar, lemon juice, and lemon zest or lemon oil and heat to a boil. Reduce heat to a simmer and cook for 6-7 minutes.

In a small bowl combine ½ Tbsp cornstarch and ¼ cold water till well mixed together. Add cornstarch mixture to blueberry mixture and simmer for 3-4 minutes or until desired thickness.