Here is the resulting recipe:
In a large, heavy pot, combine:
1/4 C sugar
1 T corn starch
4 C mixed fruit (such as a bag of frozen strawberries, blueberries, raspberries, and blackberries)
Cook, stirring constantly, until mixture thickens and boils.
Pour into an ungreased 2-quart casserole dish or 9"x13" baking pan.
Top with Apple Crisp Topping, minus the cinnamon, nutmeg, and cloves.
Bake at 400 degrees for 25-30 minutes, until the fruit is boiling and the topping has browned.
Enjoy warm or cold, by itself or with ice cream. Delicious!