Lemon Mousse
["1 can 12 oz. evaporated milk", "1 c. sugar", "Juice and zest of 1 lemon", "vanilla wafer crumbs, optional"]
["Chill milk in small mixing bowl in freezer until crystals form around edges. Beat milk until thick. Add sugar in slowly, beating constantly. Add lemon juice and zest."]
["milk", "sugar", "lemon", "vanilla wafer crumbs"]