Grilled Roast Beef Sandwich Recipe: Au Jus-Dipped Perfection

There’s nothing quite like the deep, smoky aroma of grilled beef filling the air at a summer cookout. This method transforms simple roast beef into a perfect sandwich centerpiece with ideal char and juiciness.

I developed this technique after years of experimenting with heat levels and marinades. The key is using high-quality beef and controlling the grill temperature precisely to avoid drying out the meat.

The result is tender, flavorful beef that pairs beautifully with crusty bread and au jus for dipping. Each bite delivers that classic deli taste with a homemade touch.

Serve these sandwiches at your next gathering and watch them disappear. The process is straightforward but yields impressive results every time.

Ingredients for Grilled Roast Beef Sandwich

High-quality beef, crusty bread, and bold flavors come together for this perfect sandwich experience.

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The beef is non-negotiable here. Top round roast beef from a trusted butcher or deli counter ensures tender, flavorful slices. Look for certified Angus or prime grade if available. Most Whole Foods locations carry excellent pre-sliced options. The provolone should be Boar’s Head or similar high-quality brand—pre-shredded melts poorly and lacks depth.

No top round? Eye of round or sirloin tip work in a pinch. Swap provolone for Gouda or Swiss if you prefer a different melt. Out of Worcestershire? Soy sauce with a dash of lemon juice mimics the tang. The crusty bread must be freshly baked—day-old loaves won’t crisp properly on the grill.

Pre-sliced beef keeps 3-4 days in the fridge, unopened. Au jus can be made 2 days ahead and reheated. Assemble sandwiches just before serving to prevent soggy bread. Leftovers? Wrap tightly—they reheat well for 2-3 days.

Step-by-Step Instructions for Grilled Roast Beef Sandwich

Master this technique for restaurant-quality sandwiches with melt-in-your-mouth beef and crispy bread.

Step 1: Prepare the Au Jus for Dipping

In a small saucepan, combine the 2 cups beef broth, thinly sliced yellow onion, minced 3 cloves garlic cloves, 2 tbsp Worcestershire sauce, 1 tsp kosher salt, 0.5 tsp black pepper, and 2 tsp fresh thyme. The onion should be paper-thin for quick flavor infusion.

Bring to a gentle simmer over medium heat and cook for 10-12 minutes until the onion softens and the liquid reduces slightly. This creates a concentrated, aromatic base. Strain the mixture through a fine-mesh sieve to remove solids, then keep warm. The au jus should have a rich, brown hue and fragrant aroma.

Step 2: Assemble the Sandwich Components

Slice the 1 whole crusty Italian bread horizontally, then lightly toast the cut sides. Spread 2 tbsp mayonnaise on one half and 2 tbsp Dijon mustard on the other. The mustard’s sharpness will cut through the richness of the beef.

Layer the 8 oz provolone cheese on the mayonnaise side, then arrange the 2 lb roast beef top round evenly over the cheese. The beef should be at room temperature for even warming. Brush the outer sides of the bread with 1 tbsp olive oil to ensure crispness.

Step 3: Grill the Sandwich to Perfection

Heat a large skillet or griddle over medium-low heat and add 2 tbsp butter. Once melted, place the sandwich in the pan, oil-side down. Press gently with a spatula to encourage even contact with the heat source.

Cook for 3-4 minutes per side until the bread is golden brown and the cheese begins to melt. The provolone should be fully melted but not oozing excessively. Watch for the bread to develop a crisp, toasted exterior—this texture contrast is key.

Step 4: Slice and Serve with Au Jus

Remove the sandwich from the pan and let it rest for 1-2 minutes to allow the cheese to set slightly. This prevents it from spilling out when sliced. Cut the sandwich diagonally into 4 equal portions for serving.

Serve immediately with small ramekins of the warm au jus for dipping. Each bite should deliver a balance of crispy bread, savory beef, and gooey cheese, with the au jus adding an extra layer of depth. The sandwich is best enjoyed fresh, while the bread is still crisp.

Flavor Customization for These Flavors

Spicy Kick Addition

Add 1-2 tsp sriracha or 1 tbsp chipotle in adobo to the mayonnaise before spreading. The heat cuts through the richness beautifully. I also like adding thin-sliced jalapeños to the beef layer for extra crunch and spice. 🌶️

Herb-Infused Upgrade

Mix 1 tbsp chopped fresh rosemary into the olive oil before brushing on the bread. The piney aroma complements the beef wonderfully. For a French touch, add 1 tsp herbes de Provence to the au jus while simmering.

Cheese Variations

Swap provolone for smoked gouda for deeper flavor, or use blue cheese crumbles for a bold, tangy twist. For a triple-cheese version, layer in 2 oz sharp cheddar with the provolone. Each brings a unique character to the dish.

Bread Alternatives

Try sourdough for extra tang or rye bread for earthy depth. For a lighter option, use ciabatta rolls instead of a loaf. I often toast the bread with garlic butter for added flavor dimension.

Sauce Swaps

Replace Dijon with whole-grain mustard for texture or horseradish sauce for a kick. For a creamy option, mix 1 tbsp mayo with 1 tsp prepared horseradish. These small changes make a big impact. 🔥

Vegetable Additions

Layer in sautéed mushrooms or caramelized onions for extra depth. Spinach or arugula add freshness. I like to quickly grill bell pepper strips and include them for a sweet contrast.

Frequently Asked Questions