How to Make It
Heat oil in a large heavy skillet over medium-low. Add onions and salt; cook, stirring often, until deeply browned, 40 to 45 minutes. Add steak sauce; cook, stirring occasionally, until liquid evaporates, 4 to 5 minutes. Let cool completely, about 10 minutes. Reserve 2 tablespoons onion mixture. Stir together remaining onion mixture, sour cream, and pepper in a bowl. Top with reserved onion mixture. Sprinkle with chives and several grinds black pepper. Serve with chips.