Make Zwieback crust, line pan with it.  Chill the crust.

Preheat oven to 375.

Mix well and pour into crust:

2 beaten eggs

3/4 lb soft cream cheese

1/2 c sugar

1 tsp lemon juice or 1/2 tsp vanilla

1/2 tsp salt

Bake 20 minutes.  Remove from oven.

Cool to room temperature.  Heat oven to 425.

Mix well and pour over cake:

1 1/2 c sour cream

2 T sugar

1/2 tsp vanilla

1/8 tsp salt

Bake 5 minutes.  Cool.  Refrigerate 6-12 hours.  (Lean much further to 12.)