In a pot over medium heat add sugar, flour, salt, pineapple juice, and eggs.
Stir until thickened and add the lemon juice.
Remove from heat and cool to room temperature.
While the mix is cooling cook the Acini Di Pepe pasta according to package direction and drain. Rinse with cold water to cool pasta.
Combine the egg mixture and the pasta and the fridge for 1 hour.
Once the egg and pasta mixture is done cooling, In a large bowl add the mandarin oranges, pineapple chunks, crushed pineapple, cool whip, marshmallows, and shredded coconut and gently mix well till all combined.
Combine the fruit and marshmallow mixture with the pasta mixture.
Put in the fridge till cold.