Beat yolks, three-fourths cup sugar, and vanilla sugar. Add oil and juice and continue beating.

In a separate bowl, beat egg whites until stiff, then add remaining sugar and beat until peaks form.

Sift flour and baking powder and combine with nuts and chocolate.

Fold whites into yolk mixture by hand. Add flour and chocolate. Pour into nine-inch tube pan

Bake at 350 for one hour.

Preheat oven to 350 degrees Fahrenheit.