Roast Beef Sliders with Caramelized Onions and Horseradish Sauce
These Roast Beef Sliders with Caramelized Onions and Horseradish Sauce are the clear winner for your next game day party! Tender roast beef, provolone cheese and caramelized onions on sweet Hawaiin rolls slathered with a homemade horseradish cream. So delicious!
Servings: 12 sliders
Ingredients
Caramelized Onions
- 2 Tbsp. olive oil
- 2 Tbsp. butter
- 5 cups sliced yellow onion
- ! Tbsp. Worcestershire sauce
- 1/2 tsp. coarse kosher salt
- 1/2 tsp. black pepper
Horseradish Sauce
- 1/3 cup mayonnaise
- 2 Tbsp. horseradish
Sliders
- 1 12-count package Hawaiian rolls
- 3/4 lb. deli roast beef, thinly sliced
- 12 slices provolone cheese
Butter Topping
- 8 Tbsp. butter
- 1 Tbsp. Dijon mustard
- 2 tsp. Worcestershire sauce
- 1 Tbsp. sesame seeds
- 1 Tbsp. poppy seeds
Instructions
Caramelized Onions
- In a large deep skillet, melt butter along with your olive oil over medium-low heat. Add onions and cook until caramelized, stirring occasionally, for about 35-40 minutes. Add kosher salt and pepper and Worcestershire sauce and stir until well combined. Then remove the onions from the heat.
Horseradish Sauce
- In a small bowl, mix together your mayo and horseradish until well combined.
Sliders
- Preheat oven to 350 degrees. Line a 9x13 pan with parchment paper or aluminum foil. Spray with nonstick cooking spray.
- Using a large knife, slice the rolls in half so you have a portion of tops and a portion of bottoms. You want both portions of the rolls to remain connected, so there are two slabs. Spread both halves with your horseradish sauce. Place the bottom portion in your prepared pan.Top the bottom half with six slices of your provolone cheese. Top the cheese evenly with your roast beef slices. Top the roast beef with your caramelized onions. Top the caramelized onions with six more slices of provolone cheese and then top with your buns.
Butter Topping
- Melt your butter in the microwave or a small saucepan. Whisk in your Dijon mustard and Worcestershire sauce. Brush the top of the buns with your butter mixture, getting in all the nooks and crannies.Sprinkle the buns with your sesame and poppy seeds before covering the sliders with foil and baking for 20-25 until the cheese is melted. You'll remove the foil and continue to cook for 5 minutes or until lightly browned on top. Cut into individual sliders and serve immediately.
Notes
Ask the person at the deli counter to slice your roast beef nice and thin for these sliders.
I like provolone for these sammies, but you could also use cheddar, swiss or whatever cheese is your fave.
When you slice your hawaiian rolls, make sure to slice them in half horizontally without separating them.