Butter sides and bottom of 10 inch spring form pan.

CRUST:

2 c. Zwieback crumbs
1/2 c. confectioners' sugar
1 tsp. grated lemon peel

1 stick butter

Press crumbs firmly with fingers to bottom and sides of pan.

FILLING:

3 lbs. soft cream cheese
1 tsp. grated lemon peel
1 tsp. vanilla

Add gradually, blend smooth after each addition.

1 1/3 c. + 8 tsp. sugar
3 tbsp. flour

Beat together and add gradually to cheese, beating smooth after each addition.

5 eggs
2 egg yolks

5 tbsp. heavy cream

Bake at 250 degrees for 1 3/4 hours. Turn oven off, let stand in oven 1 hour longer. Cool completely. Chill overnight.

Serves 12-14.