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French Onion Steak Sandwich

Juicy, cheesy, and packed with sweet caramelized onions—this sandwich is everything you love about French onion soup in handheld form!
Course: main dish
Cuisine: American
Keyword: French Onion Steak Sandwich
Yield: 4

Materials

For the Steak:

  • 1½ lbs thinly sliced steak ribeye, sirloin, or flank steak work well
  • 1 tablespoon olive oil
  • 1 tablespoon Worcestershire sauce
  • Salt and black pepper to taste
  • Optional: garlic powder or steak seasoning
  • For the Caramelized Onions:
  • 2 large yellow onions thinly sliced
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar helps with caramelization
  • ¼ teaspoon salt
  • Optional: splash of beef broth or balsamic vinegar for extra richness
  • Other Sandwich Ingredients:
  • 4 hoagie rolls French rolls, or baguettes
  • 8 slices provolone or Swiss cheese
  • 2 tablespoons mayonnaise or garlic aioli optional
  • Fresh parsley for garnish optional

Instructions

Step 1: Caramelize the Onions

  • In a large skillet over medium-low heat, melt the butter and olive oil.
  • Add the sliced onions, salt, and sugar.
  • Stir frequently, cooking low and slow for about 25–30 minutes until the onions are golden brown and soft.
  • > Tip: Add a splash of beef broth or balsamic vinegar at the end to deepen the flavor.

Step 2: Cook the Steak

  • In a separate skillet, heat olive oil over medium-high heat.
  • Add the sliced steak and season with salt, pepper, and Worcestershire sauce (plus garlic powder, if using).
  • Cook just until browned—only 4–6 minutes, depending on the thickness. Don’t overcook to avoid dryness.
  • Turn off the heat and mix in the caramelized onions.

Step 3: Build the Sandwiches

  • Preheat your oven broiler or toaster oven.
  • Slice the rolls and toast them open-faced for 2–3 minutes until lightly crisp.
  • Spread mayo or garlic aioli on the rolls, if desired.
  • Pile the steak and onion mixture generously onto each roll.
  • Top with 2 slices of provolone cheese per sandwich.
  • Broil just until the cheese is melted and bubbly—watch closely!

Step 4: Serve and Enjoy

  • Remove from the oven, sprinkle with chopped parsley, and serve hot with your favorite sides. These are best eaten fresh while the cheese is gooey and the bread is warm!
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