Italian Meringue Cheesecake

Fasten your aprons; we're taking a trip to Italy. Mama mia! Feather-light meringue makes this one the tops.

Preheat the oven to 375 degree F.
In a medium-sized bowl, combine the flour, 1/2 cup granulated sugar, the melted butter, 2 eggs, 1 teaspoon orange rind, and the salt. Stir the mixture until it forms a ball, then place the dough into a 9-inch deep dish pie plate. With your fingers, spread the dough into a smooth crust to cover the bottom and sides of the plate; chill while preparing the filling.
Meanwhile, in a medium-sized bowl, with an electric beater on medium speed, beat the ricotta cheese, confectioners' sugar, the remaining 2 whole eggs and 3 teaspoons orange rind, and the cinnamon for 2 to 3 minutes, until well blended. Pour into the chilled crust and bake for 40 to 45 minutes, until almost set in the center.
In a large bowl, with an electric beater on high speed, beat the egg whites and the remaining 1/4 cup granulated sugar for 5 to 6 minutes, until stiff peaks form. Spread over the top of the pie, sealing the edges of the crust with the meringue. Bake for 15 to 20 minutes, until golden brown on top. Allow to cool to room temperature, then cover loosely and chill for at least 4 hours before serving.