2 (3 oz.) or 1 lg. sugar free lemon Jello
2 c. hot water
2 c. diet 7-Up
2 c. pineapple, drained
3-4 bananas
2 c. miniature marshmallows

Stir first 3 ingredients and let partially set. Add rest of ingredients and top with light Cool Whip. Sprinkle with nuts.