How To Caramelize Onions
Step 1: Add Onions
Heat 2 Tbsp. olive oil in a skillet, and add 4 lb. (about 12 cups) chopped or sliced sweet onions such as Vidalia, Texas 1015, Maui, or Oso Sweet. Sugar may be added to speed caramelization. A teaspoon of chopped fresh herbs or 1/2 tsp. dried herbs such as thyme or rosemary lend nice flavor.
Step 2: Cook
Cook, stirring occasionally, until onions begin to turn golden and liquid has evaporated (about 20 minutes). (Increase heat slightly if liquid doesn't begin to evaporate.)
Step 3: Cook Until Golden-Brown
Continue to cook about 20 more minutes until onions develop a deep golden-brown color. Expect some onions to stick to the pan; in fact, allow it.