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steak sandwich on cutting board

Steak Sandwich with Creamy Horseradish

  • Author: Teri Turner
  • Prep Time: 5 minutes
  • Cook Time: 15 minutes
  • Total Time: 20 minutes
  • Yield: 2 sandwiches
  • Category: Sandwich
  • Method: Oven
  • Diet: Gluten Free


This Steak Sandwich is perfect for weeknight eating or a quick and easy lunch!


For the Creamy Horseradish Dressing:

1 cup Mayonnaise (regular or Whole30)

¼ cup grated horseradish or 2 tablespoons prepared horseradish

2 tablespoons chives

1 teaspoon Dijon mustard

1 teaspoon red wine vinegar

½ teaspoon Kosher salt

¼ teaspoon freshly ground black pepper


For the Sandwich:

1/2 teaspoon Kosher Salt

1 (½ pound) Porter Road Flat Iron Steak

1 tablespoon extra virgin olive oil

4 slices of your bread of choice, we used Sourdough

8 slices of Provolone Cheese

2 tablespoons parmesan cheese, divided

Romaine lettuce

1 avocado, sliced

Marinated Red Onions and its oil


Preheat the oven to 400°F.


Make the dressing by blending all the ingredients together in a food processor or blender.


Salt the steak on both sides. In a medium skillet over high heat, heat 1 tablespoon of olive oil. Once oil is hot, cook steak until browned and seared, about 3 1/2 minutes per side—a total of 7 minutes for medium rare (or, if preferred, about 6 minutes total for rare and 8 minutes total for medium). Set aside and allow to rest.


On a baking sheet in the oven or in the toaster oven, toast the bread until light brown, about 5 minutes. Remove from the oven and add two slices of provolone to each slice of bread and 1 tablespoon of parmesan on half of the slices of bread. Return the slices to the oven until cheese is melted and bubbling, about 3 minutes.


Make the sandwiches: Spread a generous amount of the horseradish dressing over the slices of bread. Using a sharp knife, slice the steak across the grain in ¼-inch strips and layer them over the dressing. Add the romaine lettuce,  avocado, and marinated onion plus a drizzle of the onion oil. Season with a pinch of salt, close the halves together and enjoy these delicious juicy steak sandwiches!

Keywords: steak sandwich, sandwich