Ingredients
Pickled caramelized onions:
1 tablespoon butter
2 large red onions, halved, thinly sliced crosswise (about 6 cups)
4 1/2 tablespoons red wine vinegar
1 1/2 teaspoons sugar
Preparation
Melt butter in large skillet over medium-high heat. Add onions, sprinkle with salt, and sauté until beginning to brown, stirring frequently, about 10 minutes. Add vinegar and sugar and cook until almost all vinegar is absorbed, about 1 minute. Season with salt and pepper. Transfer to microwave-safe bowl; cool. DO AHEAD: Can be made 2 days ahead. Cover; chill. Microwave in 15-second intervals until lukewarm before using.
