Prepare pie plate by spraying lightly with spray oil.
In a large mixing bowl, combine slice strawberries, rhubarb, and sugar.
Add lemon juice and zest. Toss to combine
Add cornstarch to fruit mixture, toss to combine and set aside for 15-20 minutes.
Line pie plate with bottom pie crust. Add fruit mixture.
Top with pie crust. Cover crust edges with aluminum foil to prevent edges from burning.Bake at 425 degrees for 15 minutes. Reduce heat to 350 and bake an additional 40-50 minutes. Remove foil last 15 minutes of baking.