Passover Israeli Upside-Down Apple Cake
    Batter: To prepare the apples, melt the margarine and the sugars in the bottom of a deep round pan large enough to hold the apples comfortably.  Arrange the apples over the sugar.  Fill the core openings with walnuts and raisins.
Pour the lemon juice over the apples.  Bake in a preheated 375F oven for 30 - 45 minutes, until the apples are tender.

To prepare the batter, in a large mixing bowl, beat the egg yolks with the sugar until very light.  Add the lemon juice and sifted potato starch.  In a clean bowl, with clean beaters,  beat the egg whites until stiff but not dry.  Carefully fold the beaten egg whites into the egg yolk mixture.  Pour the batter over the hot apples and bake for an additional 30 minutes or until cake tests done. Let the cake rest on a cake rack for 10 minutes before turning it out, upside down, onto a large cake plate.  Serve cold.