Preheat oven to 350°. Beat egg yolks until thickened and pale. Add milk and yogurt, grated peel and orange juice, then beat in 3/4 of the sugar, flour, & vanilla until smooth. In a large bowl beat the egg whites on medium speed until they are foamy. Beat in the remaining sugar on high until stiff peaks form. Gently fold in the yolk mixture into the whites until combined. Pour the batter into a 9-inch square cake pan. Place the pan in a larger container and pour in boiling water until it comes half way up the outer sides of the cake pan. Bake the cake in the oven for about 30 minutes or until it is golden. Serve with sweetened fruit yogurt, if desired

>From Lebanese Cooking: An Introduction to This Special Middle Eastern Cuisine by Ward, Susan, p.125. 641.5956 Ward