Begin by boiling the pasta for 10 minutes. Once the pasta has cooked, drain and rinse under cold water to stop the cooking and allow it to cool.
Next, it's time to make the custard. In a medium saucepan over medium heat, whisk together the pineapple juice, sugar, flour, eggs, and salt, bringing the mixture to a slow boil.
Continue whisking every minute or so for about 2 minutes, allowing the custard to thicken. Remove the pot from the heat, transfer the custard to a large mixing bowl, and stir in the lemon juice.
Allow the custard to fully cool, and then combine the custard and pasta by stirring them together.
The next day, stir together the whipped topping and marshmallow fluff. Transfer the mixture to the bowl of custard and pasta along with the fruit and marshmallows.
Lastly, Fold all the ingredients in and serve topped with Whipped Cream and Maraschino Cherries.