3 hour Onions are very jammy and sweet and almost melt on to grilled meats or sandwiches. You take your pealed onions cut in half and slice and place in pans. Just sprinkle with a couple tablespoons of extra virgin olive oil and let them roast at 350 degrees for three hours.
After three hours, besides the delicious onions you get this really delicious onion syrup to use in pan sauces or just brush on meats or sandwiches.
3 hour onions are similar to confit onions. Confit onions should be cooked at 200 degrees for 8-12 hours along with butter wine and bay leaves.