Split 1 9" plain-cake layer into 2 layers- place 1 layer on waxed paper- place ice-cream layer on top; spread with 1/4 cup jelly, jam, or drained canned crushed pineapple; top with second cake layer. Now work quickly: Spread sides of cake with whipped cream; on top, spread thin layer jelly; then decorate cake with whipped cream in pastry tube. Freeze till cream is set- freezer-wrap; freeze. To serve, thaw in refrigerator about 1 hr.
SWEETHEART CAKE: In 2 waxed paper lined heart-shaped layer pans, bake cake made from cake mix. Cool- remove from pans. Press 1 qt. raspberry sherbet into same waxed-paper-lined pans; freeze. Unmold each sherbet layer onto one cake layer; set one on top of other. Freeze-wrap; freeze. To serve, thaw in refrigerator about 1 hr.- then frost sides with 1 pt. heavy cream, whipped.