place in 3 quart saucepan:
2 peeled, cored, and chopped ripe mangoes
1 peeled, cored, and chopped apple
1 cup chopped onion
3/4 cup sugar
1/2 cup chopped red bell pepper
1/2 cup raisins
1/4 cup chopped crystallized ginger (i subbed dried ginger powder and it was ok)
1/2 cup cider vinegar
2 tsp red chile flakes
1.5 tsp mustard seeds
1/2 tsp salt

bring to a vigorous boil (despite appearances, there will be enough liquid
to boil.  keep stirring.)

the simmer (no lid) for 40-ish minutes until everything is tender and the
liquid is kind of syrupy.  continue to stir at least once per 5 minutes.

frankly i suspect that you could play with almost everything here--maybe not
the mustard seeds, vinegar and onions, but all the rest could be wiggled.
i certainly don't measure out stuff like the onion and red bell pepper.
probably you could cut down on the sugar, definitely you could up the chile
flakes--this was not spicy at all. (i think they mean the kind you put on
pizza, but i used something tastier called "aleppo pepper" from penzey's
spice co).  and you could leave out the raisins, though i wouldn't