Yema Cake Recipe - Cake, 1 cup plain flour, 2 tbsp cornstarch, 1/2 tsp salt, 1 1/2 tsp baking powder, 3/4 cup sugar, 4 eggs seperated, 1/4 cup oil, 1/4 cup water, 2 tbsp lemon juice, 1/4 tsp cream of tartar, frosting, 1 can condensed milk, 1 can evaporated milk, 1/4 cup butter and 4 egg yolks, topping.