Cream margarine with sugar until light and fluffy.

Sift flour, salt, baking powder and vanilla sugar and add alternately with oil. Set aside one cup of this mixture.

In a separate bowl, beat whip cream. Add eggs, lemon rind and juice. Add crumb mixture.

Pour into lined nine by 13 inch pan or into greased tube pan. Sprinkle reserved crumb mixture on top.

Bake at 350 degrees Fahrenheit for 45 minutes to one hour.