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Set oven to 325 degrees.
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Prepare an ungreased 10-inch tube pan.
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In a large bowl, sift together flour, baking powder and salt, then sift one more time, then beat in oil, egg YOLKS, 1/4 cup plus 3 tablespoons lemon juice, water and lemon peel with an electric mixer at low speed for about 3 minutes.
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In a large dry copper or stainless steel bowl beat the room temperature egg whites with cream of tartar until stiff but not dry.
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Fold in about 1/4 of the whites into the batter to lighten, the gently fold in the remaining whites.
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Pour the batter into the ungreased tube pan.
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Tap on the counter to release any air pockets.
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Bake for about 1-1/4 hours, or until the cake is springy to the touch.
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Immediately invert cake in pan over neck of a bottle (I use an empty beer bottle for this).
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Cool the cake completely while inverted.
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Remove the cake from the bottle and place on the counter.
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Run a knife around the edges of the pan to loosen cake.
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Transfer the cake to a serving plate.
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Dust with powdered sugar.