1 1/2 c. graham cracker crumbs
1/2 c. sugar
6 tbsp. melted butter

Mix crust ingredients together and pat in buttered 9-inch spring form pan going 2 1/2 inches up sides.

FILLING:

2 1/2 lbs. cream cheese, softened
1/4 c. whipping cream
1 3/4 c. sugar
3 tbsp. flour
2 tsp. each lemon and orange peels
1 tsp. vanilla
6 eggs

In large bowl beat cream cheese with cream. Add sugar, flour, lemon and orange peels, and vanilla. Beat at high speed until fluffy. Add eggs one at a time and beat until smooth. Pour into crust. Bake in preheated 500 degree oven for 10 minutes. Lower heat to 250 degrees. Bake 1 hour more. Cool in pan on rack 2 hours. Take spring form side off. Chill well or overnight.