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Preheat oven to 325°.
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Spray a tube pan with cooking spray.
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Coat the bottom and sides of the pan with ground almonds; set aside.
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In a large grease free bowl beat the egg whites with an electric beater till foamy. Add the salt and the cream of tartar.
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Beat on high speed until the egg whites form into soft peaks; add almond extract.
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Gradually add the sugar.
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Beat to stiff peaks.
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Gently and slowly fold in the flour.
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Spoon the batter into the tube pan. Sprinkle the top of the batter with the sliced almonds and place immediately in the preheated oven.
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Bake 45 minutes or until a cake tester comes out clean.
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Turn out of pan onto cooling rack.