french onion soup burgers

How To Make french onion soup burgers

• 1

  Heat olive oil over medium heat in large cast iron skillet. Add onions, salt and red pepper flakes and cook, stirring every 5 minutes or so, for about 15 minutes, until they begin to color.
• 2

  Add the butter and continue to cook, stiriring occasionally, for another 15 minutes until onions are caramelized and sweet. Remove to a plate.
• 3

  Mix together the seasoning ingredients, (salt, pepper, onion powder, garlic powder and sugar.)
• 4

  Shape burger into 4 patties and season with seasoning mixture. Wipe out skillet, grease, and heat over medium heat. Place burgers in skillet and cook for a few minutes until half-way cooked, turn over and cook to your desired doneness.
• 5

  When burgers are done, remove the pan from the heat, dash each burger with worcestershire, place a slice of fontina on top of each, and cover the skillet with a lid.
• 6

  Meanwhile, turn oven broiler on high. On a baking sheet place buns cut side up and place a slice of gruyere on each piece. Place under broiler until cheese bubbles up and browns.
• 7

  Remove from boiler, add the burgers and caramelized onions and serve.
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