Cheddar Burgers with Balsamic Onions and Chipotle Ketchup

Cheddar Burgers with Balsamic Onions and Chipotle Ketchup
Cheddar Burgers with Balsamic Onions and Chipotle Ketchup

PREP TIME

--

minutes

TOTAL TIME

--

minutes

SERVINGS

6

servings

PREP TIME

--

minutes

TOTAL TIME

--

minutes

SERVINGS

6

servings

Ingredients

  • ONIONS:

  • 1

    pound red onions, cut crosswise into 1/3- to 1/2-inch-thick rounds

  • Olive oil

  • 3/4

    teaspoon coarse kosher salt

  • 1/2

    teaspoon coarsely ground black pepper

  • 2

    tablespoons balsamic vinegar

  • CHIPOTLE KETCHUP:

  • 1

    cup ketchup

  • 1 1/2

    teaspoons chopped chipotle chiles from canned chipotles in adobo

  • plus 2 tablespoons adobo sauce from can

  • 2

    teaspoons (or more) balsamic vinegar

  • BURGERS:

  • 2 1/4

    pounds ground beef (15% to 20% fat)

  • Coarse kosher salt

  • 6

    thick slices sharp cheddar cheese

  • 6

    large English muffins or hamburger buns, split, cut sides grilled

  • 6

    tomato slices (optional)

  • 2

    cups fresh spinach leaves

Directions

FOR ONIONS: 1. Prepare barbecue (medium-high heat): Arrange onion rounds on baking sheet. Brush with oil; sprinkle with3/4 teaspoon coarse salt and pepper. Transfer onion rounds (still intact) to grill rack; close cover. Cook until grill marks appear, about 4minutes per side. Reduce heat or move onions to cooler part of grill. Close cover; cook until onions are tender, about 10 minutes. Transfer to medium bowl. Toss with vinegar. DO AHEAD: Can be made 3 days ahead. Cover; chill. FOR CHIPOTLE KETCHUP: 1. Mix ketchup, chiles, adobo sauce, and 2 teaspoons vinegar in small bowl. Season with salt and more vinegar, if desired. DO AHEAD: Can be made 3 days ahead. Cover and chill. FOR BURGERS: 1. Shape beef into six 1/2-inch thick patties. Sprinkle patties on both sides with coarse salt and pepper. 2. Prepare barbecue (medium-high heat). Place burgers on grill. Close cover; cook burgers until bottoms start to darken and juices rise to surface, about 3 minutes. Turn burgers; cook to desired doneness, about 3 minutes longer for medium-rare. 3. Top with onions and cheese. Close cover; cook until cheese melts. Place muffin bottoms on plates; spread with ketchup. Top with burgers, tomatoes, if desired, spinach, and muffin tops. Serve, passing remaining ketchup separately.

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