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Cream shortening and sugar in a bowl until light and fluffy.
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Add mixture of flour, baking powder and salt, alternately with mixture of grape juice and milk, mixing well after each addition.
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Add vanilla.
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Fold beaten egg whites, gently into batter.
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Pour into 2 greased and floured 9" cake pans.
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Bake at 350* for 25 minutes, or cake tests done.
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Cool in pans for 10-15 minutes.
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Turn out onto wire racks to cool completely.
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Split each layer horizontally.
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Spread 1 1/2 cups GRAPE FILLING between layers.
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Spread GRAPE FROSTING over top and side of cake.
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Drizzle remaining filling over top.
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GRAPE FROSTING.
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combine sugar, egg whites, grape juice and syrup in double boiler.
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Beat at low speed with electric mixer until well blended.
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Place over boiling water.
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Beat at high speed for 7 minutes or until stiff peaks form.
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Remove from heat; beat until of spreading consistency.
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Yield; enough frosting for 4 layers.
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GRAPE FILLING:.
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combine sugar, cornstarch, salt, grape juice and 1 cup of water in a saucepan, mix well.
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Bring to a boil over medium high heat.
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boil for 1 minute, stirring constantly.
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Remove from heat.add lemon juice and butter.
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Cool.
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Yield.enough frosting for a 2 layer cake.
