To prepare a deep dish rhubarb and strawberry tarts recipe, you will first need to prepare your tart shells. You will need: 2 tbsp. sugar, 2 tablespoons butter, and 1 teaspoon vanilla extract. Preheat your oven to 375?F (190?C) and grease the bottom and sides of the tart pan with cooking spray. Cut the strawberries in half lengthwise and remove the white membrane from the fruit. Place the sliced strawberries on the baking sheet and sprinkle with the sugar. Bake for 20 to 25 minutes or until the crust is golden brown. Remove from oven and allow to cool before serving.