1. In two separate bowls, separate the egg whites from the egg yolks.
2. In a bowl, sift flour by cups. Add salt, baking powder and 1/2 cup white sugar. Mix thoroughly. Make a well and set aside.
3. Add the oil, egg yolks, milk, water, and vanilla to the flour mixture. Mix until well-combined.
4. For the meringue: Beat egg whites together with the cream of tartar until bubbly. Gradually add the 1/2 cup of white sugar then beat until soft peaks form.
5. Divide the meringue into 4 parts.