Cook 2 thinly sliced large red onions in a skillet with 1/4 cup olive oil over low heat, covered, until golden, 30 minutes. Stir in 3 tablespoons cider vinegar, 2 tablespoons brown sugar and 1 teaspoon grated peeled ginger; season with salt. Cook until thick, about 20 more minutes.
Photograph by Levi Brown
Recipe courtesy Food Network Magazine