The French Dip Sandwich Melt is a cozy, satisfying sandwich packed with tender roast beef, melted cheese, and toasted bread that’s perfect for dipping into rich, flavorful au jus. The combination of juicy meat and melty cheese makes every bite a delight, and that warm dip on the side takes it to the next level.
I love making this sandwich when I want something comforting but still easy to put together. One of my favorite tricks is to make sure the bread is nicely toasted so it holds up well when dipped, and the cheese smiles with gooey goodness all melted over the roast beef. It always feels a little like a treat without being complicated.
Serving it with a steaming cup of au jus for dipping just can’t be beat—it’s the perfect way to add moisture and flavor to every bite. I usually pair it with some crispy fries or a simple salad for a meal that feels just right whether it’s lunch or dinner. This sandwich always brings a little warm comfort to the table!
Key Ingredients & Substitutions
Roast Beef: Thinly sliced roast beef works best for tenderness and flavor. Leftovers or deli-style roast beef are convenient options if you’re short on time.
Provolone Cheese: Provolone melts beautifully and adds a mild, creamy taste. If you prefer, mozzarella or Swiss cheese also make great melts.
Caramelized Onions: Slowly cooked onions bring sweetness that balances the beef. If you’re in a rush, store-bought caramelized onions can be a handy shortcut.
Hoagie or Baguette Rolls: Choose sturdy rolls with a good crust to hold up to dipping without getting soggy. Ciabatta or sourdough are nice alternatives.
Au Jus: Beef broth is the base here. Adding red wine adds depth, but it’s optional. Worcestershire sauce brings extra savory notes. For a richer jus, reduce it slowly to concentrate flavors.
How Do I Get the Perfect Cheese Melt Without Burning the Sandwich?
The key to melting the cheese nicely is to use your oven’s broiler for just a few minutes. Here’s how:
- Preheat the broiler and place your assembled sandwich on a baking sheet.
- Slide the pan on a rack about 4-6 inches from the heat source.
- Watch it closely—about 2 to 4 minutes is usually enough for the cheese to turn gooey and the bread to toast lightly.
- Pull the sandwiches out the moment you see the cheese melted and bubbling. Broilers work fast, so don’t walk away.
This method keeps the bread crisp without burning and gives you that luscious melted cheese texture that makes the sandwich so satisfying.
Equipment You’ll Need
- Large skillet – perfect for caramelizing onions slowly and evenly without burning.
- Medium saucepan – you’ll simmer the au jus here for rich, flavorful dipping sauce.
- Baking sheet – holds the sandwiches under the broiler to toast bread and melt cheese nicely.
- Sharp knife – essential for slicing rolls without squashing them.
- Small bowls or cups – great for serving warm au jus for dipping.
Flavor Variations & Add-Ins
- Swap provolone for Swiss or mozzarella for a milder or creamier melt.
- Try adding sautéed mushrooms to the beef for an earthy, meaty boost.
- Use thinly sliced turkey or ham instead of roast beef for a lighter version.
- Add a spread of horseradish sauce or Dijon mustard inside the roll for a little extra kick.
French Dip Sandwich Melt
Ingredients You’ll Need:
For the Sandwich:
- 1 lb roast beef, thinly sliced or shredded (preferably cooked or leftover)
- 4 hoagie rolls or French baguette rolls
- 1 cup caramelized onions (about 2 large onions, sliced)
- 8 slices provolone cheese (2 per sandwich)
- 2 tbsp butter, softened
- Fresh thyme sprigs (optional, for garnish)
For the Au Jus:
- 4 cups beef broth
- 1/2 cup dry red wine (optional, for richness)
- 1 tbsp Worcestershire sauce
- 1 garlic clove, minced
- 1/2 tsp onion powder
- Salt and freshly ground black pepper, to taste
- 1 tsp cornstarch mixed with 1 tbsp water (optional, for thickening)
How Much Time Will You Need?
This recipe takes about 40 minutes total. About 25-30 minutes for the caramelized onions, 10-15 minutes for the au jus simmering, then 5-7 minutes for assembly, broiling, and serving. It’s a quick but totally rewarding meal!
Step-by-Step Instructions:
1. Preparing the Caramelized Onions:
Heat a skillet over medium-low heat and add a little oil or butter. Add the sliced onions and cook slowly for 25 to 30 minutes, stirring occasionally. You want the onions soft, deeply golden, and sweetly caramelized. Once done, set aside.
2. Making the Au Jus:
In a medium saucepan, combine beef broth, red wine (if using), Worcestershire sauce, minced garlic, and onion powder. Bring to a gentle simmer and let it cook for 10 to 15 minutes to build flavor. Season with salt and pepper to your liking. For a thicker au jus, stir in the cornstarch mixed with water and cook until slightly thickened. Keep warm.
3. Assembling the Sandwiches:
Preheat your oven’s broiler. Slice the hoagie rolls lengthwise without cutting all the way through. Lightly butter the outside of each roll. Pile each roll with a good amount of roast beef, then add the caramelized onions on top, followed by two slices of provolone cheese.
4. Melting the Cheese:
Place the sandwiches on a baking sheet under the broiler. Broil just until the cheese melts and the bread is toasted nicely, about 2 to 4 minutes. Watch carefully so nothing burns.
5. Serving:
Put the sandwiches on plates. Pour warm au jus into small bowls or cups alongside for dipping. Garnish with fresh thyme sprigs if you like, for a pretty touch.
6. Enjoying:
Dip each bite of your sandwich into the savory au jus, savoring that classic French Dip flavor. Pair with fries or a crisp salad for a filling meal that’s full of comfort and taste.
Can I Use Pre-Cooked or Deli Roast Beef?
Yes! Pre-cooked or deli roast beef works perfectly and speeds up the process. Just make sure it’s sliced thin for easy layering and quick warming under the broiler.
How Can I Make Au Jus Ahead of Time?
You can prepare the au jus a day in advance. Store it in an airtight container in the fridge and gently rewarm it on the stove before serving, adding a splash of beef broth if it’s thickened too much.
Can I Freeze Leftover Sandwiches?
It’s better to assemble and heat fresh for best texture, but you can freeze the roast beef and au jus separately. Thaw overnight in the fridge and reheat gently before assembling your sandwich.
What’s the Best Bread for French Dip Sandwich Melts?
Use sturdy rolls like hoagies, French baguettes, or ciabatta that have a crusty exterior. These hold up well to dipping without getting soggy.