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French Onion Beef Sloppy Joes

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Caramelized onions, juicy ground beef, and melty Gruyère cheese come together in these French Onion Beef Sloppy Joes—a cozy, bistro-inspired twist on the classic comfort food sandwich. Perfect for family dinners, game days, or whenever you crave a hearty, flavorful meal with minimal fuss.

Ingredients

Scale
  • 2 tablespoons unsalted butter (for caramelizing onions)
  • 2 large yellow onions, thinly sliced (about 3 cups)
  • 1 pound ground beef (80/20 or 85/15)
  • 2 cloves garlic, minced
  • 1 tablespoon tomato paste
  • 1 tablespoon Worcestershire sauce
  • 1/2 teaspoon dried thyme (or 1 teaspoon fresh thyme)
  • 1/2 teaspoon kosher salt (or to taste)
  • 1/4 teaspoon black pepper
  • 1/2 cup beef broth (low-sodium preferred)
  • 4–6 sturdy sandwich buns (brioche, potato, or hamburger buns)
  • 1 cup shredded Gruyère or Swiss cheese (divided)
  • 2 tablespoons unsalted butter (for toasting buns)
  • Fresh parsley, chopped (optional, for garnish)
  • Extra cheese, for topping (optional)
  • Pickles or French-fried onions (optional, for crunch)

Instructions

  1. Melt 2 tablespoons butter in a large skillet over medium-low heat. Add sliced onions and a pinch of salt. Cook, stirring occasionally, until onions are deep golden brown and reduced in volume, about 20-25 minutes. Add a splash of water if onions start to stick.
  2. Increase heat to medium. Add ground beef to the onions, breaking it up with a spoon. Cook until browned and no longer pink, about 5-7 minutes. Drain excess grease, leaving a little for flavor.
  3. Stir in minced garlic and tomato paste. Cook for 1-2 minutes, letting the tomato paste darken slightly.
  4. Add Worcestershire sauce, thyme, salt, pepper, and beef broth. Stir to combine. Bring to a gentle simmer and cook until the mixture thickens and most liquid is absorbed, about 5-7 minutes. Adjust seasoning as needed.
  5. Remove from heat. Stir in half the shredded Gruyère (about 1/2 cup) until melted and creamy. Reserve the rest for topping.
  6. While the beef simmers, melt 2 tablespoons butter in a clean pan or on a baking sheet under the broiler. Split buns and toast, cut side down, until golden and crisp.
  7. Spoon the hot beef and onion mixture onto each toasted bun bottom. Top with remaining cheese. For extra melt, broil assembled sandwiches for 1-2 minutes, watching closely.
  8. Garnish with chopped parsley or French-fried onions if desired. Top with bun lids and serve immediately.

Notes

For gluten-free, use GF buns or serve over baked potatoes. For vegetarian, substitute plant-based crumbles and vegetable broth. Caramelizing onions slowly is key for the best flavor—don’t rush this step. Toasting the buns prevents sogginess. The filling can be made ahead and reheated; assemble sandwiches just before serving for best texture.

Nutrition

Keywords: French onion, sloppy joes, beef sandwich, comfort food, caramelized onions, Gruyère, easy dinner, game day, family meal, sandwich recipe

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