Preheat oven to 350 degrees. Combine flour, sugar, baking powder and salt in bowl and
stir to mix. Add in order- the cold water, the oil, vanilla, lemon zest, and one by one the
five egg yolks. Set batter aside. Combine egg whites and cream of tartar and beat until
very stiff (much stiffer than angel food cake). Fold egg whites into the batter and pour
batter into an ungreased tube pan. Bake 40 minutes. Hang upside down over a bottle
until cake is cool. Turn out.
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