Frog's Eye Salad

A Utah classic that didn't make it into Mom's repertoire until at least 1994, when my second oldest brother left home.  He says that he did not grow up eating this and that it is not part of his understanding of family classics.  It is part of mine.

Custard
Cook until thick (1 minute):
1 C sugar
2 T flour
1 3/4 C pineapple juice
2 eggs, beaten

Add 1 T lemon juice.

Cook 1 package frog's eye pasta. 

Drain 2 cans pineapple chunks
3 cans mandarin oranges
1 can crushed pineapple
9 oz. non-dairy cream
1 package small marshmallows

Combine ingredients when pasta is cool.  Chill.