5 cups watermelon puree (about 1 large watermelon)
1 1/2 tablespoons unflavored gelatin
1 1/2 cups sugar
1/4 teaspoon ground nutmeg
1 1/2 cups milk
1 1/2 teaspoons fresh lime juice
Soften gelatin in ½ cup of the watermelon puree. Let stand 5 minutes at room temperature and then heat gently to dissolve gelatin. Cool slightly. Add remaining watermelon puree, sugar, nutmeg, lemon juice and milk to gelatin mixture. Freeze in ice cream freezer according to appliance directions.