French Onion & Roast Beef Grilled Cheese Sandwich Recipe - (4.3/5)

French Onion & Roast Beef Grilled Cheese Sandwich Recipe - (4.3/5)

www.keyingredient.com

Grilled cheese sandwiches are just fine with cheese. But when the cheese is Gruyère, and you add roast beef and caramelized onions, it's over the top.

Keywords

  • French Onion & Roast Beef Grilled Cheese Sandwich
  • recipe
  • beef
  • onion
  • Fruits
  • Vegetables and Other Produce
  • Main Ingredients
  • vegetable
  • Meat & Poultry
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Ingredients

  • 1 tablespoon olive oil
  • 1 small onion, sliced
  • 1 teaspoon thyme leaves
  • Kosher salt
  • Pepper
  • 4 slices (1/2-inch-thick) rye bread
  • 1 tablespoon unsalted butter or olive oil, melted
  • 1 tablespoon whole-grain mustard
  • 2 ounces Gruyère cheese, grated
  • 2 slices roast beef

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