1 (6 oz.) pkg. lemon Jello
1 c. boiling water
2 c. ice water
1 lg. can (about 16 oz.) crushed pineapple, drain & save juice
6 bananas, sliced
2 c. mini marshmallows
1 c. pineapple juice
1 egg, beaten
1 1/2 tbsp. flour (or 1 tbsp. cornstarch)
1/2 c. sugar
1 (12 oz.) Cool Whip
1 c. grated Cheddar cheese

In large bowl, dissolve Jello in boiling water. Add ice water, pineapple, banana and marshmallows. Pour into large flat dish. Chill until firm.

While chilling, heat pineapple juice. Mix flour, sugar and egg together and stir into hot juice and cook until thick, stirring constantly. Let cool completely, then fold in Cool Whip. Spread Cool Whip mixture over chilled Jello. Sprinkle top with grated cheese. Cover and chill.