Egg Whites Cake

Directions

1. 1
   Preheat oven to 160 degrees Celsius.
2. 2
   Beat the egg whites to stiff peaks with a pinch of salt and the baking soda.
3. 3
   Add the sifted sugar gradually, beating with the electric mixer each time you add some.
4. 4
   Slowly mix in the flour little by little using a wooden spoon.
5. 5
   Add the vanilla and lemon zest.
6. 6
   Pour in an ungreased angel food cake pan.
7. 7
   Bake for about 35 minutes or until cooked through. Remove from oven, and turn upside down on the serving plate.
8. 8
   Allow to stand until cool and the cake falls naturally.