I'm asking for a friend. Someone I know picked up a large catering tray of leftovers from a church function, 4th of July breakfast, that was destined to get thrown out. Apparently there was some confusion about what was in it. Maybe that would have been a better destination.

The result is that this person I know has way way to many onions. They are about 1/8th of the way through being carmalized. Clearly a carmalization attempt was applied to these onions already. But the most important detail is the sheer scale.

Of course tossing them is a perfectly good option. But maybe they can be salvaged for something useful. What would you do with a large tray of cooked (though not very cooked) onions?