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Separate eggs, placing whites in a large mixing bowl. Sprinkle cream of tartar on egg whites and beat on high until soft peaks form.
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Slowly add in 1/2 cup of the sugar until whites are stiff but not dry.
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In a medium sized bowl, sift flour, sugar, salt, and baking powder together.
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Make a well in the sifted ingredients and add oil, egg yolks, water, and extract. Beat until smooth.
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Fold egg yolk mixture gradually into beaten egg whites. Pour batter into ungreased angel food cake pan.
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Bake at 350F for 45 min or until cake is golden and springs back when touched.with a finger. Cool upside down by balancing the inside ring of the pan on a bottle or funnel (if your pan doesn't have cooling legs).