Air Cake - cooking recipe

Ingredients

4 eggs, separated
1 1/4 c. sugar
2/3 c. water
1 1/2 c. flour
1 tsp. vanilla
1 tsp. cream of tartar

Preparation

Put egg yolks into mixing bowl.
Beat at low speed 2 minutes. Add water and beat until foams like whites.
Add small amounts of sugar at a time, beating 4 minutes.
Add flavoring, flour with cream of tartar, beating in small amounts at a time.
Beat for 4 minutes.
Add pinch of salt to egg whites.
Beat until dry.
Fold into mixture.