Janie may call this easy-to-prepare dish a salad, but we say it is sweet enough to be served as a dessert. The yellow of the pineapple and the red of the strawberries make a pretty presentation.
Partially thaw the berries. Combine in a 12-cup bowl with the condensed milk, Cool Whip, pineapple, and marshmallows. Mix well. Freeze until solid.
Remove from the freezer about 1 hour before serving. Sprinkle with the nuts, if desired.