French Dip Sliders

Savory beef sliders with melted cheese served with hot au jus for a delicious dipping experience.

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Preheat the oven to 180°C (350°F). Split 12 rolls horizontally and lay the bottoms in your baking dish, tops set aside. Spread provolone evenly over the bottom halves and set aside.
Heat vegetable oil in a large skillet over medium heat. Add sliced onion and cook until translucent, about 6–8 minutes. Add minced garlic and sauté until fragrant.
Pour in beef broth, Worcestershire sauce, and soy sauce if using. Bring to simmer, then reduce to medium and simmer until slightly reduced, about 8–10 minutes. Season with salt and pepper to taste.
If desired, whisk cornstarch with cold water and stir into the simmering jus, cooking until it thickens slightly.
Layer roast beef over the provolone in the baking dish. Cover with foil and bake for 6–8 minutes, until the cheese melts and beef is heated.
While beef heats, butter the roll tops and toast cut-side down in a skillet until golden brown.
Spread Dijon on tops if using and place them on the melted cheese.
Serve with hot au jus for dipping.

These sliders are best served immediately for optimal texture. Make-ahead options are available for convenience.