Prepare Jello with water, stir in drained pineapple, pour into 9" x 13" pan.. Cover with miniature marshmallows. Place in refrigerator to cool. Once cooled, spread topping over marshmallows. Sprinkle with cheddar cheese. ** TOPPING ** Melt butter in saucepan, add flour for a rue and cook well over medium high heat. Slowly add pineapple juice, pour in sugar and whisk until mixture thickens. Put in the refrigerator to cool. Once the JELL-O mixture has set up, mix the topping mixture with a small tub of Cool Whip. Per Serving (excluding unknown items): 108 Calories; 4g Fat (35.1% calories from fat); 1g Protein; 17g Carbohydrate; trace Dietary Fiber; 8mg Cholesterol; 39mg Sodium. Exchanges: 0 Grain(Starch); 0 Lean Meat; 1/2 Fruit; 1 Fat; 1/2 Other Carbohydrates.