1 lb. ricotta cheese
1 lb. cream cheese
1 1/2 c. sugar
4 eggs
1 tbsp. lemon juice
1 tsp. vanilla
3 tbsp. cornstarch
3 tbsp. flour
1 pt. sour cream
1/4 lb. melted butter

In mixer, cream the cheeses with the sugar; beat in eggs one at a time. Add each of the following ingredients one at a time: lemon juice, vanilla, cornstarch, flour, sour cream, and last the melted butter.

CRUST:

Butter a 9-inch spring form pan and sprinkle with graham cracker crumbs. Bake in a 350 degree oven for 1 hour; shut off heat and let it stay in oven for 2 hours. DO NOT OPEN OVEN DOOR!