Red Onion Marmalade Recipe

  • 2 tablespoons olive oil
  • 1 tablespoon butter
  • 2 large red onions, thinly sliced
  • 1/4 cup white sugar
  • 1 cup dry red wine
  • 1/4 cup balsamic vinegar
  • salt to taste
  1. Heat olive oil and butter in a large skillet over medium heat; cook and stir onions and sugar in hot oil until onions start to caramelize, about 15 minutes. Stir red wine and balsamic vinegar into onion mixture and bring to a boil. Reduce heat to medium-low and simmer until liquid is evaporated, 15 to 20 minutes more. Season with salt.