Ingredients

The following ingredients have 3 Servings
  • 2 tablespoons olive oil
  • 4 large onions, thinly sliced (about 10 cups sliced)
  • 3 tablespoons balsamic vinegar
  • 2 tablespoons brown sugar
  • 1 1/2 teaspoons finely chopped fresh rosemary or 1/2 teaspoon dried rosemary
  • 1/4 teaspoon kosher salt
  • 1/4 teaspoon freshly ground black pepper

Instruction

  • Preheat oil in a large skillet over medium heat. Add onions. Cook, stirring occasionally, until onions are soft, translucent, and just beginning to brown, about 20 minutes. Stir in balsamic vinegar, brown sugar, rosemary, and salt and pepper. Continue to cook, stirring occasionally, until liquid is evaporated and onions are dark brown and reduced to 3/4 cup, about 40 minutes more. Remove from heat and let cool. Store in a glass jar or airtight container in the refrigerator for up to 1 week.