gelatin in hot water. Add sugar and stir until dissolved. Stir in milk, evaporated milk, lime juice, peel and food coloring. Pour into an 8-inch square dish or 2 refrigerator trays. Freeze 2 to 3 hours, or until firm.

When completely frozen, break into chunks with wooden spoon and turn into a chilled bowl. Beat with an electric mixer, on high, until fluffy and smooth. Return quickly to cold dish or trays and freeze firm. Cover with foil when frozen. This will keep several weeks. Serve plain or with fruit.