Ingredients

2 tablespoons vegetable oil

1 medium onion, finely chopped (about 1 cup)

1 celery rib, finely chopped

3 garlic cloves, minced (about 1 tablespoon)

1 pound ground beef chuck

1/2 pound ground pork

1/2 pound ground veal or turkey

1/2 cup sour cream

1/2 cup fresh bread crumbs (see “how to make fresh bread crumbs” below)

1/4 cup Dijon mustard

2 teaspoons kosher salt

1 teaspoon freshly milled black pepper

1/3 cup chili sauce (the kind you serve with shrimp cocktail or you can make your own by combining 2/3 ketchup with 1/3 bottled horseradish)

Preparation

  1. Heat 1 tablespoon of the oil in a large ovenproof skillet over high heat until hot. Reduce the heat to medium; add the onion, celery, and garlic and cook, stirring occasionally, until softened, about 5 minutes. Transfer to a rimmed baking sheet, spreading out the mixture, and place in freezer to cool slightly. Combine the beef, pork, veal, sour cream, bread crumbs, 2 tablespoons of the mustard, the salt, and pepper; stir in the onion mixture. Shape into 6 equal burgers.
  2. Heat the remaining tablespoon of oil in the skillet over high heat until hot; reduce the heat to medium and add the burgers to the pan. Cook the burgers for 6 minutes a side or until they are almost cooked through (nice and pink; they should be almost firm to the touch and have very little pink color inside). Transfer the burgers to a rimmed baking sheet.
  3. Meanwhile, combine the chili sauce and the remaining 2 tablespoons mustard. Preheat the broiler to high. Spoon the chili sauce over each burger to cover well and place the skillet under the broiler. Broil for 2 minutes or until the topping begins to bubble.