2 1/2 c. sifted cake flour
3 tsp. baking powder
1 3/4 c. sugar

Sift together in a bowl. Make a well and add in order given:

1/2 c. salad oil
5 unbeaten egg yolks
3/4 c. water
2 tsp. vanilla

Beat 6 egg whites with 1 teaspoon cream of tartar until peaks form. Pour egg yolk mixture over whites and fold very gently. Sprinkle in 3 squares grated unsweetened chocolate. Fold in with a few strokes. Pour in an ungreased tube pan. Bake at 325 degrees for 55 minutes, then at 350 degrees for 10-15 minutes.