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Ingredients

• 1 1/4 pounds ground beef (preferably chuck)
• Kosher salt and freshly ground pepper
• 2 teaspoons extra-virgin olive oil, plus more for brushing
• 1 small red onion, halved and thinly sliced
• 1 8-ounce package sliced mixed mushrooms
• 1 tablespoon Worcestershire sauce
• 1/4 cup ketchup
• 2 teaspoons dijon mustard
• 4 thin slices gruyere cheese
• 4 sesame buns, split and toasted
• Boston or Bibb lettuce, for topping
• Potato chips and/or pickles, for serving (optional)

Description

Food Network Invites You To Try This Swiss Mushroom Burgers Recipe From Food Network Magazine.

Food Network