In a small bowl, whisk the cornstarch and water together until all the cornstarch has dissolved.

Place the cornstarch mixture, along with the rest of the ingredients, into a small saucepan over medium heat. Using a wooden spoon or rubber spatula, stir the mixture as it cooks. Break up some of the strawberries as you stir.

Bring it to a simmer and allow to simmer for 5 minutes, stirring constantly. After 5 minutes, remove pan from the heat and allow to cool. Add vanilla extract. The mixture will thicken as it cools.