Bring the water to a boil over medium high heat. Once boiling, slowly add in the berries and sugar. Boil for 10 minutes. Using the potato masher, mash the berries.

In a small bowl, mix together the starch and water until smooth.

Remove the pot from the heat and whisk in the starch mixture. Keep whisking until smooth.

Return the pot to the heat and turn the heat to low.

Simmer until thickened. Approx 10 minutes.

Remove from heat. Cool and enjoy.

It will thicken as it cools.

Store extra sauce in a sealed container in the refrigerator.