If you do not have an ice-cream machine, place in a plastic container and put into the freezer. When icicles begin to form around the edges, beat back to a smooth texture. Repeat once more. This dessert can be served inside a halved pawpaw. Should you wish to stand the pawpaw as pictured, cut a straight edge on the end of the stem side of the pawpaw to create a flat stable platform. To make the chocolate swirl: melt a good quality chocolate and spread over a wax proof surface. When chocolate has partly hardened, cut into thin strips and twist.