Potato Flour Sponge cake
9 eggs, separated
1-2/3 cups sugar
1 lemon, rind and juice
1 scant cup potato flour
Beat the yolk til light and creamy, adding sugar gradually. Add grated rind and juice of a lemon, beat thoroughly,
and stir in potato flour a little at a time, beating after each addition. Fold in stiffly beaten egg whites.
Turn into large springform angel food cake pan and bake at 300 deg. at least for 1 hour.
(The recipe says 45-50 minutes, but I found that is not enough. Do not take it out of the oven unless the top springs back when touched).
Cool up-side down, and remove from the pan carefully.
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