To prepare a torta rustica recipe, first you need to prepare the filling. First, you'll need the following ingredients: 14 cup (60 ml) ricotta, 1 tablespoon (2.5 g) grated Parmesan cheese, 2 tablespoons (4.9 oz) olive oil, and salt and pepper to taste. Then, preheat the oven to 375 ?F (191 C) and grease and flour two 9-inch (23 cm) round tart shells. Set aside. Using an electric mixer, beat the egg whites on medium-high speed until stiff peaks form. Gradually add the sugar, beating well after each addition. Add the vanilla and beat until the mixture is light and fluffy, about 2 minutes. Pour the batter into the crusts and bake for 20 to 25 minutes, or until browned and set. Remove from oven and allow to cool before serving.