Coconut-Lemon Cake

Beat butter at medium speed with an electric mixer until fluffy; gradually add sugar, beating well. Add egg yolks, one at a time, beating after each addition. Combine flour and baking powder; add to butter mixture alternately with milk, beginning and ending with flour mixture. Beat at low speed until blended after each addition. Stir in 1 tsp. vanilla. Beat egg whites and salt at high speed with an electric mixer until stiff peaks form. Stir about one-third of egg whites into batter; fold in remaining egg whites. Spoon batter into 3 greased and floured 9-inch round cake pans. Bake at 350 ° for 18 to 20 minutes or until a wooden pick inserted in center comes out clean. Cool in pans on wire racks 10 minutes; remove from pans, and cool completely on wire racks. Spread Lemon Filling between layers. Spread Fluffy White Frosting on top and sides of cake. Sprinkle top and sides with coconut; garnish, if desired. Note: Boxwood is poisonous if ingested. If boxwood sprigs are used as garnish, cut small circle of heavy-duty plastic wrap, and position in center of cake before arranging sprigs and cranberries on top of cake. Remove garnish before serving.