Grandma's Cheesecakecakes, cheesecakes 1 pound Ricotta cheese 1 pound Cream cheese 1/2 cup Butter; melted 1 cup Sugar 4 each Eggs Juice of 1 lemon 1 teaspoon Salt 1 teaspoon Vanilla 3 tablespoons Flour 3 tablespoons Cornstarch 1 pint Sour cream Zwieback crumbs; fine |