Toss rhubarb, sugar, and cornstarch in a bowl to coat.
Move sugar coated rhubarb to stove top, at medium high heat, stirring continuously until beginning to soften.
Stir in strawberry and stir briefly at high heat to mix together, then remove from head and quench cool.
Preheat over to 400.
Cook at 400 for 30 minutes or until done.