Step 1

Place 1 1/2 cups blueberries in a small saucepan. Cover with water and add sugar and vanilla. Heat over medium-high heat until mixture comes to a low boil and blueberries just start to break apart.

Step 2

Add dissolved cornstarch to saucepan and bring mixture to a rolling boil. Turn heat down and simmer on low heat for 2-3 minutes, or until sauce reaches desired consistency. Add water, one tablespoon at a time, if the sauce gets too thick.

Step 3

Remove from heat. Add remaining blueberries and stir gently. Serve warm or cold.