Caramelized Onions (Ina Garten Barefoot Contessa)

I've made this recipe twice and enjoyed them both times. The thyme gives the onions a special flavor. I have not tried it with fresh thyme yet, only dried. I used Vidalia onions when they were in season and sliced them very thin using a mandolin. Ina recommends using a good quality olive oil, of course.

• Ready In: 47 mins
• Serves: 6

Ingredients

• 2  tablespoons olive oil
• 2  tablespoons unsalted butter
• 2  lbs yellow onions, peeled and sliced in half-rounds
• 1⁄2 teaspoon fresh thyme leave
• 2  tablespoons sherry wine vinegar
• 1  teaspoon kosher salt
• 1⁄2 teaspoon fresh ground black pepper

Directions

1. Heat olive oil and butter in a large shallow pot, add onions and thyme and toss with the oil.
2. Place the lid on top and cook over medium low heat for about 10 minutes to sweat the onions. Remove the lid and continue to cook over medium low heat, stirring occasionally for 25 to 30 minutes, until t he onions are caramlized and golden brown. This could take much longer than 30 minutes, if your stove top is on a very low setting. If the onions are cooking too fast, lower the heat. Don't rush the process. It is worth the wait.
3. Add the sherry wine vinegar, salt and pepper and cook for 2 more minutes, scraping the brown bits from the pan. Season to taste. They should be highly seasoned.