For Rum Cream: ============== In the top of a double boiler, blend the egg yolks and sugar. Place this over boiling water and whisk until warm to the touch. Add the butter, 1 or 2 pieces at a time. When all of the butter has been incorporated, whisk until lightly thickened, 1 or 2 minutes longer. Remove from heat and cool, whisking occasionally. When cool, gradually whisk in the rum and fold in about one third cup of whipped cream. Cut off the base and stem of the pineapple, reserving a few small leaves for garnish. Quarter the pineapple lengthwise and then remove the skin and core with a sharp knife. Slice each quarter lengthwise into 1 cm-thick slices. To Assemble: ============ Arrange the pineapple slices on chilled plates, overlapping slightly. Gently curl the cantaloupe slices in the shape of an "S" and place 2 pieces on each plate as garnish. Garnish with reserved pineapple leaves. Spoon some of the rum cream over the pineapple and serve remainder of the cream on the side.