Okay. I got funding for the onions, and it's a slightly cooler day today, so here goes:
Sliced 6 yellow onions, mixed with 1/4 cup oil, put in the oven covered at 350. I plan to try a combination of covered and uncovered.
After 1 hour, onions are a pale-ish yellow, soft, with a very little bit of crunch left to them. They taste kind of bland.