Only sugar and heat need be present to
caramelize a food.
Sweet onions such as Vidalia and Oso will
caramelize a little faster, but all onions will eventually turn brown and take on a deep, rich flavor that enhances a variety of dishes (see box below).
Remove from pan and add onion, carrot, celery, garlic and mushrooms then
caramelize. Add tomato paste and cook for three minutes.
Sprinkle with sugar, using a hand-held propane torch,
caramelize the sugar, and set aside.