French Dip Roast Beef Baguette with Rosemary Au Jus

This French Dip Roast Beef Baguette is the ultimate comfort sandwich: a crusty baguette toasted to perfection, piled high with tender roast beef, sweet caramelized onions, and melted provolone, then dunked into a rich, rosemary-infused au jus.

Every bite is a savory, juicy explosion of flavor and texture. It's surprisingly simple to make at home, yet tastes like it came from a gourmet deli. Perfect for a satisfying weeknight dinner or a game-day crowd-pleaser.

The classic French dip gets a rustic upgrade with a crusty baguette and a deeply flavorful rosemary au jus. This recipe uses thinly sliced deli roast beef, which makes it quick and easy, while the slow-cooked caramelized onions and fresh herbs elevate the sauce to something truly special.

The bread is broiled until crisp, the cheese is melted to a golden bubble, and the whole sandwich is meant to be dipped into the warm, savory broth. It's a hands-on, messy, and utterly delicious meal that will have everyone reaching for more.

Ingredients

Why this recipe works

The magic of this French dip lies in the contrast between the crusty, toasted baguette and the tender, juicy beef. Broiling the bread gives it a crackling exterior that holds up beautifully to the au jus, while the interior stays soft and soaks up the flavorful broth. The caramelized onions add a deep, sweet note that complements the savory beef and rich, herby jus.

Simmering the roast beef in the au jus does double duty: it warms the meat gently without drying it out, and it infuses the beef with the rosemary, thyme, and Worcestershire flavors.

This step ensures every bite is moist and packed with umami. The result is a sandwich that is both comforting and elegant, with layers of flavor that develop quickly but taste like they've been simmering all day.

Notes and substitutions

For the best results, use a good-quality baguette with a sturdy crust that can stand up to dipping. A day-old baguette works well because it's even crustier.

Thinly sliced deli roast beef is the most convenient choice, but leftover roast beef sliced thin will also work beautifully. The provolone cheese melts smoothly and has a mild, nutty flavor that doesn't overpower the beef.

If you don't have fresh rosemary and thyme, you can use dried herbs, but reduce the amounts by half. The au jus is the heart of this dish, so use a rich beef stock or broth. If you prefer a more intense flavor, you can reduce the au jus by simmering it longer before serving. This recipe can easily be doubled to feed a crowd.

• provolone cheese: Swiss cheese or mozzarella
• deli roast beef: leftover roast beef, sliced thin
• fresh rosemary: 1/2 tsp dried rosemary
• fresh thyme: 1/2 tsp dried thyme

Equipment

• Large skillet
• Saucepan
• Baking sheet
• Chef's knife
• Cutting board
• Tongs
• Foil