Dissolve gelatin in hot water, then add cold water. Cool mixture and set aside.
Wash and grind cranberries. Pare and chop apples (and oranges, if using) into small chunks. Stir together the ground cranberries, chopped apples and oranges (or pineapple), nuts, and sugar.
Add to slightly thickened gelatin mixture; then pour into a mold and chill until salad is firm and holds its shape. Unmold onto salad greens.
