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Leftover Roast Beef — Easy 10-Minute French Dip Sandwiches

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Prep Time 5 minutes
Cook Time 10 minutes
Total Time 15 minutes
Servings: 4 servings
Ingredients Method

Ingredients
  

  • Leftover roast beef (thinly sliced; about 8–12 ounces for 2–3 sandwiches)
  • Crusty rolls (French rolls, hoagie rolls, or baguette sections)
  • Provolone or Swiss cheese (2–4 slices, optional but recommended)
  • Beef broth or stock (2 cups; low-sodium preferred)
  • Worcestershire sauce (1–2 teaspoons)
  • Soy sauce or tamari (optional, 1 teaspoon for depth)
  • Onion powder (1/2 teaspoon)
  • Garlic powder (1/4–1/2 teaspoon)
  • Black pepper (to taste)
  • Butter (1–2 tablespoons, for toasting rolls)
  • Optional add-ins: a splash of dry sherry, a pinch of dried thyme, or a dash of hot sauce

Method
 

  1. Warm the au jus. In a small saucepan, add beef broth, Worcestershire, soy sauce (if using), onion powder, garlic powder, and black pepper. Bring to a simmer over medium heat. Taste and adjust seasoning. If you have pan drippings or leftover gravy, whisk in a spoonful for extra flavor.
  2. Heat the beef gently. Reduce the au jus to low. Add the sliced roast beef and warm for 1–2 minutes. Don’t boil it—just let it loosen and heat through so it stays tender.
  3. Toast the rolls. Split your rolls and spread with butter. Toast cut-side down in a skillet over medium heat until golden and crisp. This keeps the sandwiches from getting soggy.
  4. Assemble with cheese. Layer warm beef onto the toasted rolls, letting a little au jus drip off back into the pan. Top with provolone or Swiss. If you want it extra melty, place the open sandwiches under the broiler for 30–60 seconds. Watch closely.
  5. Serve with hot au jus. Ladle the hot au jus into small bowls. Serve immediately and dip each bite as you go.