Cook the acini de pepe pasta in a pot of boiling water with 1 teaspoon of salt according to package directions. Drain and rinse with cold water.
1 cup uncooked acini de pepe pasta
Drain and reserve the pineapple juice from both cans of pineapple.
20 ounces pineapple tidbits, reserve juice, 10 ounces crushed pineapple, reserve juice
In a small saucepan, combine the reserved pineapple juice, sugar, egg, salt, and cornstarch over medium heat. Whisk well and cook, stirring constantly, until slightly thickened. Remove from heat and cool completely.
1 cup reserved pineapple juice, 1 large egg, 1/4 teaspoon salt, 1 Tablespoon cornstarch, 1/2 cup granulated sugar
Combine the cooled sauce and pasta and stir well. Cover and refrigerate at least 2 hours or overnight.
Add the crushed pineapple, pineapple tidbits, mandarin oranges, coconut, and marshmallows to the sauce and stir to combine.
15 ounces mandarin oranges, drained, 1 cup shredded sweetened coconut, 1 cup mini marshmallows
Whip the cream with the powdered sugar until soft peaks form, then add to the pasta and fruit. Serve immediately, or refrigerate and serve chilled.
1 cup heavy whipping cream, 1/4 cup powdered sugar