Wash grapes, separate skins from pulp. Cook pulp into soft, sieve to remove seeds. Add skins, then stir in sugar. Juice oranges and lemons. Thinly slice peels, cover with cold water, heat to a boil. Drain and add to grape mixture with fruit juices. Cook until thick, about 40 minutes. Add nuts. Pour in hot sterilized jars. Seal at once. Makes about 10 (1/2 pints).