The French Dip Sandwich Melt is a comforting and delicious meal that features tender slices of roast beef piled high on a toasted bun, topped with melted cheese, and served with a warm, flavorful au jus for dipping. The combination of juicy beef, gooey cheese, and crispy bread makes every bite satisfying and full of flavor.
I love making this sandwich when I want something that feels a little special but is still easy to put together. The key for me is to use good-quality roast beef and to let the cheese get nice and melty—this makes the sandwich extra cozy. Plus, dipping each bite into the rich au jus is honestly the best part!
When I serve this French Dip Sandwich Melt, I usually pair it with some crispy fries or a simple side salad for a balanced meal. It’s perfect for a relaxed weekend lunch or dinner, and I find that everyone enjoys the combination of textures and flavors. It’s one of those meals that’s great for sharing or just treating yourself to something tasty!
Key Ingredients & Substitutions
Roast Beef: Thinly sliced medium-rare roast beef is perfect for tenderness and flavor. If unavailable, deli roast beef works, but warming it gently prevents dryness.
French or Hoagie Rolls: Choose crusty rolls that hold up to dipping. Substitutes could be baguettes or ciabatta for a different texture.
Provolone Cheese: This melts nicely without overpowering the beef. Swiss, mozzarella, or fontina can be good alternatives.
Caramelized Onions: They add sweetness and depth. Yellow onions work best. If short on time, pre-sliced sautéed onions from the store can be used.
Au Jus (Beef Broth Dip): Homemade or store-bought beef broth works, enhanced with Worcestershire, herbs, and spices for deeper flavor.
How Do You Get the Perfectly Caramelized Onions?
Caramelizing onions slowly is key to unlocking their natural sweetness without burning them.
- Use medium heat and butter for a rich flavor.
- Cook onions slowly, stirring occasionally to avoid sticking or burning, about 15–20 minutes.
- Adding a pinch of salt helps draw out moisture and tenderizes onions.
- If they start sticking, add a splash of water to deglaze the pan.
- Patience is your friend here — good caramelized onions take time but add great taste.
Equipment You’ll Need
- Large skillet – perfect for caramelizing onions evenly without crowding.
- Small saucepan – keeps your au jus warm and ready for dipping.
- Spatula or tongs – helps you toast rolls and handle sandwiches easily.
- Sharp knife – to slice rolls without crushing them.
- Lid or foil – traps heat so the cheese melts nicely on the sandwich.
Flavor Variations & Add-Ins
- Switch roast beef for thinly sliced turkey or ham for a lighter twist.
- Try swiss or mozzarella cheese for a milder melt with a creamy texture.
- Add sautéed mushrooms along with onions for extra umami flavor.
- Mix fresh thyme or rosemary into the au jus for a different herb aroma.
How to Make French Dip Sandwich Melt
Ingredients You’ll Need:
Main Ingredients:
- 1 lb thinly sliced roast beef (medium rare preferred)
- 4 hoagie or French rolls, split
- 8 slices provolone cheese
- 2 large onions, thinly sliced
- 3 tbsp butter
Au Jus Dip:
- 2 cups beef broth
- 1 tsp Worcestershire sauce
- 1 tsp garlic powder
- ½ tsp dried thyme
- Salt and black pepper, to taste
Optional Garnish:
- Fresh parsley, chopped
How Much Time Will You Need?
This recipe takes about 25 minutes in total. Around 15-20 minutes to caramelize the onions, 5 minutes to prepare the au jus and toast the rolls, and a few minutes to assemble and melt the cheese on the sandwiches. It’s a quick, satisfying meal that’s easy to make anytime!
Step-by-Step Instructions:
1. Caramelize the Onions:
Heat 1 tablespoon of butter in a large skillet over medium heat. Add thinly sliced onions and cook slowly, stirring occasionally until golden and caramelized, about 15-20 minutes. Sprinkle with a pinch of salt and pepper. Once done, remove from heat and set aside.
2. Prepare the Au Jus:
In a small saucepan, combine beef broth with Worcestershire sauce, garlic powder, dried thyme, and a pinch of salt and black pepper. Warm over low heat and keep hot until serving.
3. Toast the Rolls:
Lightly butter the outside of each hoagie or French roll. Heat a skillet or griddle over medium heat and toast the rolls butter-side down until golden and crispy. Remove from heat.
4. Assemble and Melt the Sandwiches:
Open the toasted rolls just enough to hold the fillings. Layer warm roast beef generously inside, then add the caramelized onions on top. Place two slices of provolone cheese over the fillings. Return sandwiches to the skillet or griddle, cover loosely with a lid or foil, and warm until the cheese melts (about 1-2 minutes).
5. Serve and Enjoy:
Place sandwiches on plates. Serve each hot with a small bowl of warm au jus for dipping. Garnish with chopped fresh parsley, if you like. Dip each bite in the savory au jus and enjoy the delicious combination of melted cheese, tender beef, and crispy bread!
Can I Use Frozen Roast Beef for This Sandwich?
Yes, but be sure to thaw it completely in the fridge overnight. Pat it dry before warming to avoid excess moisture that can make the sandwich soggy.
How Can I Make This Recipe Vegetarian?
Try substituting the roast beef with grilled mushrooms or a plant-based deli meat. Use vegetable broth seasoned with soy sauce or Worcestershire-style sauce for the au jus.
What’s the Best Way to Store Leftovers?
Store any leftover sandwich components separately in airtight containers in the fridge for up to 3 days. Reheat the beef and onions gently on the stove, and toast the rolls again before assembling.
Can I Prepare the Caramelized Onions Ahead of Time?
Absolutely! Caramelized onions keep well in the fridge for up to 4 days or can be frozen for longer. Just reheat them gently before adding to your sandwich.
