I love how onions become meltingly tender and sweet after a long roast in the oven, but it’s not such an elegant look to plop roasted onions on a platter. Here the petals stay together in a pretty rosette, thanks to a muffin pan. If you don’t have one, use a small rimmed baking sheet or an ovenproof dish and pack the onions tightly together.
To store: Refrigerate in an airtight container for up to 4 days. Tip: If the stem is the North Pole, you’re cutting through the onion’s equator.