Brown Derby Grapefruit Cake

Directions

1. 1
   Sift together flour, sugar, baking powder and salt into a bowl.
2. 2
   Make a well in center and add water, oil, egg yolks, grapefruit juice and lemon peel.
3. 3
   Beat until very smooth.
4. 4
   Beat egg whites with cream of tartar until stiff but not dry. Gradually pour egg yolk mixture over egg whites.
5. 5
   Fold in gently until just blended.
6. 6
   Do not stir.
7. 7
   Turn batter into an ungreased 9-inch springform pan and bake at 350° for 30 minutes or until top springs back when touched lightly with finger.
8. 8
   Invert onto rack and cool thoroughly.
9. 9
   Loosen edges of cake carefully and remove cake from pan.
10. 10
    With a serrated knife, cut cake crosswise to make two layers.