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A glossy French onion beef sloppy joe on a toasted brioche bun, packed with seasoned ground beef, caramelized onions, and melted cheese.

French Onion Sloppy Joes

Savory-sweet French onion sloppy joes with slowly caramelized onions, seasoned ground beef, and melted provolone or Swiss cheese on toasted buns. A elevated twist on the classic that comes together in about 30 minutes.
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Prep Time 10 minutes
Cook Time 30 minutes
Servings: 4
Course: Main Dish
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

  • 1 pound ground beef
  • 1 large onion thinly sliced
  • 2 cloves garlic minced
  • 1 tablespoon olive oil
  • 1 teaspoon Worcestershire sauce
  • 1 cup beef broth
  • 2 tablespoons tomato paste
  • 1 teaspoon Dijon mustard
  • Salt and pepper to taste
  • 4 slices provolone or Swiss cheese
  • 4 hamburger buns lightly toasted

Equipment

  • Large skillet with lid

Method
 

  1. Heat olive oil in a large skillet over medium heat. Add sliced onions and cook 12–15 minutes, stirring occasionally, until golden and caramelized.
  2. Push onions aside; add ground beef and cook until browned, breaking it up.
  3. Stir in garlic and cook 1 minute.
  4. Add Worcestershire, beef broth, tomato paste, and Dijon. Simmer 8–10 minutes until sauce thickens. Season with salt and pepper.
  5. Lay cheese slices over the mixture, cover, and melt 2 minutes.
  6. Spoon onto toasted buns and serve immediately.

Notes

Take time with the onions for the best flavor. Toast the buns to prevent sogginess. Provolone or Swiss both work well; mozzarella is a fine substitute. Messy in the best way—serve with plenty of napkins. Filling can be made ahead and reheated.