roast onion

I tried this today, didn't work so well. It did become soft and sweet, enough so that I ate the whole onion straight. But it didn't become anything like the spreadable caramelized form of roast garlic. I don't know if it can't, or I didn't roast it enough. I gave it a lot of time; was afraid of too high heat and making the onion peel smoke. Doesn't help that my oven has no temperature indicators, just a dial unlabeled apart from off.

OTOH I foresee eating a lot more garlic than I ever did.