Pull-Apart French Dip Sliders with Caramelized Onion Butter Step-by-step instructions

Before you start

Before beginning, ensure all ingredients are at room temperature to promote even heating. Prepare a baking sheet by lining it with parchment paper for easy cleanup and to prevent the sliders from sticking. Have your oven preheated to 375°F (190°C) at least twenty minutes before baking.

Ensure the roast beef is separated into thin layers to allow for better heat penetration. Finally, have your small bowl and pastry brush ready on the counter to streamline the assembly phase, as the process moves quickly once the butter is whisked and ready for application.

Instructions

Assembly of the Sliders

1. 1Assemble the Sliders
   Slice the brioche slider rolls horizontally. Layer the thinly shaved rare deli roast beef, caramelized onions, and aged provolone cheese evenly across the bottom halves of the rolls. Place the top halves of the rolls over the cheese to close the sliders.
   Look for Ensure the roast beef and onions are distributed evenly for consistent flavor in every bite.
   Tip Using pre-caramelized onions saves significant prep time for this recipe.

The assembly phase is complete when the brioche rolls are neatly arranged on the baking sheet with the roast beef, onions, and provolone layered securely inside. The sliders should look uniform and compact. Ensure the rolls are tightly packed together to maintain the pull-apart structure, which helps them retain heat and stay moist throughout the baking process. Once assembled, they are ready for the butter application.

Applying the Onion Butter

2. 2Prepare and Apply Onion Butter
   In a small bowl, whisk together the melted butter, onion powder, and Worcestershire sauce until well combined. Using a pastry brush, generously coat the tops of the slider rolls with the savory onion butter mixture.
   Look for The butter should be fully melted and the seasonings evenly incorporated into the fat.
   Tip Apply the butter evenly to ensure the tops of the sliders brown beautifully while baking.

The butter application is complete when the tops of the slider rolls are evenly coated with the mixture, appearing glossy and slightly seasoned with the onion powder. The aroma of the butter and Worcestershire should be apparent.

Check that the butter has not pooled at the bottom of the tray, as this can lead to excessive grease. The sliders should now look vibrant and ready for the oven, with the butter coating promising a golden finish.

Final Bake and Service

3. 3Bake and Serve
   Preheat the oven to 375°F (190°C). Bake the sliders for 14 minutes until the rolls are golden brown and the cheese is melted and bubbly. Ensure the internal temperature of the roast beef reaches 145°F (63°C). Let the meat rest for at least 3 minutes before serving. Serve immediately with a side of hot rosemary au jus for dipping.
   Look for The cheese should be completely melted and the tops of the rolls should be a deep golden brown.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Keep the rosemary au jus simmering on low heat while the sliders bake to ensure it stays hot.

The baking phase is complete when the sliders are golden brown, the cheese is bubbling, and the aroma of toasted brioche and savory beef fills the kitchen. The au jus should be hot and fragrant with rosemary. Before serving, verify that the cheese has fully melted and the rolls have achieved a light crispness. The final dish should be served immediately while the cheese is still molten and the sliders are warm and soft.

Common mistakes

A common mistake is using thick-cut roast beef, which can result in a chewy texture that is difficult to bite through. Always use thinly shaved meat. Another error is over-brushing the rolls with butter, which can make the bread soggy; use just enough to lightly coat the tops.

Additionally, avoid skipping the preheating of the oven, as this leads to uneven cooking where the cheese might not melt before the rolls become too dry. Finally, ensure the au jus is not boiling aggressively, as this can cause the delicate rosemary notes to become bitter.

How to tell it’s done

The sliders are done when the brioche tops are a deep, uniform golden brown and the cheese is fully melted and bubbling at the edges. Since the roast beef is already cooked, the primary goal is to heat the assembly through and ensure the cheese is hot.

The internal temperature of the roast beef should reach 145°F (63°C). The sliders should be firm to the touch, and the au jus should be steaming hot, indicating it is ready for immediate service and dipping.

• Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest