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.
Notes
Add more lemon: Really a little more lemon zest will add more flavor.
Short cut tip: For a smoother syrup, use an immersion blender.
Variation tip: A pinch of salt can enhance the flavor of this syrup.