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Gluten-free, kosher-for-Passover.   From Lubavitch Woman's Organization cookbook.

Preheat oven to 350 degrees.

Beat egg whites of 9 separated eggs until partially stiff. 
Add three quarters cup sugar and beat until very stiff.  Set aside. 
Mix the egg yolks with three quarters cup sugar, 1 1/3 cups potato starch and the juice of one half lemon (about 1 1/2 tbs).  
Pour into ungreased tube pan or 9 x 13" baking pan and bake at 350 for one hour.

Before removing from oven, turn off oven, open door slightly and let sit for about 10 minutes.  Remove and invert tube pan on a wine bottle (empty...don't want to ruin the wine), to cool. I don't invert the 9x13 baking pan. I just cool it on a cookie rack.

SMALLER VERSION:  There is a similar version using 7 eggs, one cup sugar, and one cup potato starch, and juice of one lemon or 3 tbs. This version calls for a greased tube pan, which I find keeps the batter from rising. And it calls for baking for three quarters of an hour.

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