Split in two some square sponge-cakes, which can be bought at the baker's for two cents each. Put a little butter in the chafing-dish. When it is hot put in the slices of cake, and brown them a little on both sides. Lay the slices on a plate, and spread each one with a layer of canned chopped pineapple. Turn the juice from the can into the chafing-dish. Moisten a teaspoonful of arrowroot with cold water, stir it slowly into the hot juice, and continue to stir until it becomes thickened and clear. Pour the sauce over the slices of spread cake. If more than a cupful of juice is used, add more arrowroot in proportion. Any kind of fruit, and slices of sponge cake or of brioche, can be used instead of the square individual cakes. Strawberries, raspberries, or peaches make good sweet canapes.