
Ingredients:-
1 cup margarine, softened


In a large mixing bowl, beat the egg yolks and 1 cup of the sugar with an electric mixer on medium-high speed for 5 minutes, scraping down the bowl once or twice. When you're done, the mixture should be thick, light, and greatly multiplied in volume. Then mix in the lemon and orange zests and juices and the vanilla extract on a very low speed for a few seconds, just until blended. Set aside.
In another large mixing bowl, with clean beaters, beat the egg whites and cream of tartar on medium-high speed until the whites are thick and quite foamy. Gradually add the remaining 1/2 cup of sugar while continuing to beat the egg whites on high speed until they are stiff and glossy but not dry, like a meringue (about 7 minutes).
Working quickly but gently, use a large rubber spatula to smoothly fold a third of the flour mixture into the beaten egg yolks. Next, fold in another third of the flour mixture along with a third of the beaten egg whites. Finally, fold in the rest of the flour, then the remaining egg whites, until the batter is evenly combined and no streaks of flour remain. Scrape the batter evenly into the tube pan and smooth the top with a spoon.
To remove the cake, run a thin-bladed knife up and down around the outside of the cake as well as around the center tube. Gently lift the cake from the pan by the tube. Then run a knife under the cake.
Invert the cake onto a plate and remove the tube. Gently rub your fingers around the side to remove any loose crumbs (it will make the finished cake look more attractive). Finally, invert the cake once more onto a serving plate so that it is right side up.You'll need:
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