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In a mixing bowl, cream shortening and sugar.
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Add egg yolks and egg,one at a time, beating well after each.
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Combine the flour, salt, baking powder and baking soda; add to the creamed mixture alternately with buttermilk.
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Beat in vanilla.
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Pour into two greased and floured 9-in.round cake pans.
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Bake at 350 for 30-35 minutes or until a toothpick inserted near the center comes out clean.
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Cool for 10 minutes before removing from pans to wire racks.
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In a saucepan, combine the sugar, cornstarch and salt.
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Drain pineapple, reserving juice.
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Add pineapple to pan.
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Add water to juice to measure 3/4 cup; pour into pan and mix well.
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Bring to a boil over medium heat; cook and stir for 2 minutes.
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Remove from the heat.
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Add butter and lemon juice.
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Cool completely.
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For frosting, in a heavy saucepan or double boiler, combine sugar,egg whites, water and cream of tartar.
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With a portable mixer, beat mixture on low speed over low heat until frosting reaches 160, about 8-10 minutes.
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Pour into a mixing bowl; add vanilla. beat on high speed until frosting forms stiff peaks, about 7 minutes; set frosting aside.
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Set aside a third of the filling.
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Spread remaining filling between cake layers.
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Spread reserved filling in a 4-in. circle in the center of top layer.
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Frost the sides of cake and around the filling on top.
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Yield: 12 servings.