French Dip Prime Rib Sandwiches with Swiss & Horseradish Aioli

This French Dip Prime Rib Sandwich takes the classic deli favorite to a new level. Tender shaved prime rib is warmed in rich beef consommé, then piled onto crusty rolls with caramelized onions and a blanket of melted Swiss cheese.

A zesty horseradish aioli adds a bright, pungent kick that cuts through the richness. The final dunk into hot au jus makes every bite juicy and deeply savory. It’s the kind of sandwich that feels like a special occasion, yet comes together in about 35 minutes.

French dip sandwiches are a beloved classic, but this version elevates them with prime rib and a homemade horseradish aioli. The beef is warmed in the same consommé used for dipping, so it stays tender and flavorful.

The rolls are toasted to hold up to the jus, and the Swiss cheese melts into a gooey blanket. This recipe delivers all the indulgence of a steakhouse sandwich in a casual, hand-held form. Perfect for game day, weeknight dinners, or anytime you crave something hearty and satisfying.

Ingredients

Why this recipe works

Warming the shaved prime rib directly in the beef consommé infuses the meat with extra savory flavor and keeps it moist. The brief 30-second dip is enough to heat the beef through without toughening it, preserving its tender texture. This method also means the jus for dipping is already perfectly seasoned and piping hot.

The horseradish aioli is the secret weapon—its creamy, tangy, and slightly spicy profile balances the richness of the beef and cheese.

Toasting the rolls provides a sturdy base that won't disintegrate when dunked into the au jus, while the caramelized onions add a touch of sweetness. Each element works together to create a sandwich that is greater than the sum of its parts.

Notes and substitutions

Use the best-quality shaved prime rib or roast beef you can find; deli-sliced roast beef also works well. If the meat is not already shaved, ask the butcher to slice it paper-thin. The French rolls should be crusty on the outside and soft inside—ciabatta or a baguette-style roll are ideal. Swiss cheese is classic, but provolone or mozzarella are fine substitutes.

Prepared horseradish is sold in jars and is already mixed with vinegar and salt; it has a stronger kick than horseradish sauce. If you only have creamy horseradish sauce, use 1 1/2 tablespoons to get enough flavor.

The lemon juice brightens the aioli, but you can omit it if you prefer a more mellow taste. The beef consommé can be purchased in cans or cartons; look for a rich, dark version.

• prepared horseradish: Use 1 tablespoon drained horseradish sauce or 1 teaspoon fresh grated horseradish mixed with a pinch of salt.
• Swiss cheese: Substitute provolone, mozzarella, or white cheddar for a similar melt and mild flavor.
• prime rib: Use leftover roast beef, deli-style roast beef, or thinly sliced steak such as sirloin or ribeye.
• French rolls: Use ciabatta, hoagie rolls, or baguette slices, as long as they are crusty and sturdy enough for dipping.

Equipment

• Small bowl
• Whisk
• Large skillet
• Sheet pan
• Broiler
• Tongs
• Serrated knife