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1
In a large bowl, cream shortening and sugar until light and fluffy. Add egg yolks and egg, one at a time, beating well after each addition. Beat in vanilla. Combine the flour, salt, baking powder and baking soda; add to the creamed mixture alternately with buttermilk, beating well after each addition.
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2
Pour into two greased and floured 9-in. round baking pans. Bake at 350u00b0 for 30-35 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pans to wire racks.
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3
In a large saucepan, combine the sugar, cornstarch and salt. Drain pineapple, reserving juice. Add pineapple to pan. Add water to juice to measure 3/4 cup; pour into pan and mix well. Bring to a boil over medium heat; cook and stir for 2 minutes. Remove from the heat. Add butter and lemon juice. Cool completely.
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4
For frosting, in a heavy saucepan, combine the sugar, egg whites, water and cream of tartar over low heat. With a hand mixer, beat on low speed for 1 minute. Continue beating on low over low heat until frosting reaches 160u00b0, about 8-10 minutes.
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5
Pour into a large bowl; add vanilla. Beat on high until frosting forms stiff peaks, about 7 minutes; set frosting aside.
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6
Set aside a third of the filling. Spread remaining filling between cake layers. Spread reserved filling in a 4-in. circle in the center of top layer. Frost the sides of cake and around the filling on top.