Prepare the pasta according the the instructions on the box. You will cook for 6 minutes.
Drain and rinse the pasta in cold water to prevent the pasta from sticking. After it has cool, you can place it in the refrigerator.
Drain the crush pineapple and reserve the juice. You need to make sure the crush pineapple is well drained. Add to a bowl.
Drain the pineapple tidbits and reserve the juice. Add the pineapple tidbits to the bowl with the crush pineapples.
Drain the Mandarin Oranges and discard the juice from the oranges. You can add the oranges to the bowl with the pineapple mixture.
Pour the pineapple juice in to a medium pot. Remove one tablespoon of the juice and set it aside.
In a small bowl whisk together the egg, with lemon juice, one tablespoon of juice and the cornstarch. Pour mixture in with the pineapple juice.
Mix in the white sugar in the the pineapple juice and egg mixture. Begin cooking the mixture over medium heat until the sauce thickens. You will need to stir constantly so it will not burn. Allow the mixture to completely cool (approximately 30 minutes.Once the sauce has completely cooled, pour over the pasta. Add the drained fruit into the cooled pasta mixture. Gently stir to mix it.
Gently fold in the coconut and marshmallow.
Gently fold in the Cool Whip.
Cover and refrigerate over night or at least 2-3 hours. You want it well chilled.
Garnish with Maraschino Cherries