Open-Faced Burgers with Onion-Mushroom Topping

Ingredients

• ½ teaspoon salt
• 2 teaspoons balsamic vinegar
• 1 medium sweet onion, sliced and separated into rings
• 1 ½ tablespoons paprika
• ½ teaspoon salt
• 2 (8-ounce) packages presliced mushrooms
• 2 teaspoons olive oil
• + 5 more ingredients
• • 2 English muffins, split and toasted
  • 1 pound ground round
  • ¼ teaspoon ground red pepper
  • ½ teaspoon dried thyme
  • ¼ teaspoon freshly ground black pepper

Preheat grill. Heat oil in a large nonstick skillet over medium-high heat. Add onion, and cook for 5 minutes or until golden. Add mushrooms and salt; cook 5 minutes, stirring constantly. Add vinegar; remove mixture from pan. Set aside. Combine the paprika and the next 4 ingredients (paprika throu...

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