Brooklyn Cheesecake

16 oz ricotta cheese
16 oz cream cheese, softened
1 1/2 cup sugar
4 eggs
Juice of 1/2 fresh lemon
1/4 tsp vanilla
3 tbl cornstarch
3 tbl flour
1/4 cup melted butter
16 oz sour cream

Instructions:

Blend together ricotta and cream cheese, and add sugar.
Beat in eggs, one at a time.
Add lemon juice, vanilla, cornstarch, flour and butter. Mix well.
Fold in sour cream and pour into buttered 10- inch spring form pan.
Put cake in a cold oven. Heat to 325 degrees, and bake for one hour.
Turn oven off and leave cake in for two more hours.
Do not open oven door while cooling.
Remove cake and finish cooling.
Wrap and refrigerate. Cake is best the next day.