Deli roast beef, melted cheese, sautéed onions, and horseradish sauce come together in a delicious way in these roast beef sliders! Great for a party or crowd, these roast beef sandwiches can easily be prepped ahead of time.
1Tablespoon (15g)cream-style horseradishmore to taste
1largeclove of garlicpressed
¾teaspoonlemon juice
Salt and pepperto taste
Sautéed Onions
½largewhite or yellow onionthinly-sliced
½largered onionthinly-sliced
1Tablespoon (14g)unsalted butter
1Tablespoon (15 ml)olive oil
Salt and pepperto taste
Sandwiches
112-ounce (340g) packageHawaiian rolls
12ounces (340g)thinly-sliced deli roast beef
3ounces (85g)thinly-sliced sharp cheddar
Butter Sauce
3Tablespoons (42g)unsalted buttermelted
2teaspoons (10 ml)Worcestershire sauce
1teaspoon (5g)Dijon mustard
Sesame seedsfor topping
Instructions
Prepare: Heat oven to 350°F. Spray a rectangular baking dish (minimum size 7.5-inch by 10.5-inch) or sheet pan with cooking spray and set aside for now.
Make the Horseradish Sauce: Add mayonnaise, horseradish, garlic, lemon juice, and salt and pepper to a bowl and stir well to combine. Refrigerate until ready to use.
Sauté the Onions: Add 1 Tablespoon unsalted butter and olive oil to a large saucepan set over medium heat. Once heated, add the sliced onions. Stir occasionally and cook until they have softened and are turning golden, about 8 minutes or so. Remove the pan from the heat once done.
Assemble Sandwiches: Keeping the rolls connected, cut through them horizontally so you have one slab of roll bottoms and one slab of roll tops. Place the bottom half in the prepared pan cut-side up.
Spread half of the horseradish sauce on the bottom cut-side of the rolls. Arrange the roast beef evenly over the whole surface, "bunching up" the slices and not laying them flat. Add a layer of cheddar cheese, then evenly scatter the sautéed onions over top.
Spread the remaining half of the horseradish sauce on the cut-side of the top half of rolls, then place them on top of the rest to complete the sandwiches.
Make the Butter Sauce: Stir together the melted butter, Worcestershire sauce, and Dijon mustard in a bowl until well combined. Slowly drizzle this sauce over top of the sandwiches, using a brush if needed to ensure the top and sides of the buns are moistened. Sprinkle with sesame seeds.
Bake: Cover the baking dish or slab of sandwiches on a sheet pan with aluminum foil and bake for 20 minutes. At this time remove the foil and bake for an additional 10 minutes, or until golden on top.
Notes
Prep Ahead: The horseradish sauce and the sautéed onions can be made up to a day ahead of assembling, kept refrigerated.Make Ahead: These sliders can be assembled, covered in foil, and refrigerated for up to one day before baking and serving.Freezer Instructions: Assemble sliders but do not add the butter sauce. Wrap in heavy-duty aluminum foil and freeze in a large air-tight bag or freezer-safe baking dish. Fully thaw in the refrigerator before adding the butter sauce and baking.Ingredient Notes
Horseradish: Prepared horseradish can also be used in place of cream-style. Start by adding a smaller amount to the sauce as it's more potent (hotter).
Hawaiian Rolls: If not available packaged dinner rolls or smaller slider-specific buns can be used instead.
Cheese: Provolone, Swiss, or gouda can be used instead.
Tips and Tricks
It's not a big deal if some rolls separate from one another when slicing. Just put them back into place.
If you want an extra crisped slider bottom, use a dark metal sheet pan. It absorbs heat quicker than stoneware or lighter metal pans and promotes more browning.
To keep cooked sliders warm for a party, wrap them in foil and place in a 200°F oven until ready to serve.
Nutritional information is provided as an estimate. As it can vary due to many factors (brands used, quantities, etc.), we cannot guarantee its accuracy.