Onion, Black Olive, and Caper Compote | America's Test Kitchen

Ingredients

• 1/2 cup olive oil
• 2 medium onions , halved and sliced thin
• 6 medium cloves garlic , sliced thin
• 1/2 cup black olives , such as Kalamatas, pitted and chopped coarse
• 1/4 cup capers
• 2 anchovy fillets , rinsed and minced
• 1/4 cup balsamic vinegar
• 1 teaspoon minced fresh marjoram leaves , or 1/2 teaspoon dried marjoram
• 2 tablespoons minced fresh parsley leaves
• Salt and ground black pepper