Passover Sponge Cake

Directions

1. 1
   Separate 6 eggs.
2. 2
   Add 2 whole eggs to yolks.
3. 3
   Beat yolks until very thick while adding sugar, a little at a time.
4. 4
   Beat until sugar is dissolved.
5. 5
   Add rind and juices.
6. 6
   Fold starch into mixture.
7. 7
   Beat whites until they form soft peaks. Add to yolks and fold until well blended.
8. 8
   Pour into 10-inch tube pan and bake until nicely browned, 325° for 1 hour.
9. 9
   Invert to cool.