Grilled Sirloin Steak Sandwich With Caramelized Onions And Horseradish Mayo

There is nothing like a perfectly cooked steak on the grill.  My son and husband could eat that for dinner every night of the week.  Sometimes, though, I like to change things up a bit.  So when I saw a TV show the other day talking about a local restaurant and its best selling sandwich which was a grilled steak sandwich with onions and horseradish mayo, I knew I had to try it at home for myself.  This sandwich consists of a grilled steak sliced paper thin and topped with cheese, caramelized onions, and horseradish mayo.  The smoky flavor of the steak pairs perfectly, of course, with the cheese and the sweet onions, but the horseradish mayo is what really takes it over the top adding a great flavor punch to the sandwich.  My family all agreed this was a keeper.

To make this yummy steak sandwich, first start by slicing three large onions (I used Vidalia) into very thin slices. Heat 2 tablespoons of butter and 2 tablespoons of olive oil in a large saute pan over medium heat.

  Add the onions. 

Saute on low for about 20-25 minutes, stirring often, until the onions are golden brown and soft, making sure to keep the temperature low so you do not burn the onions.  Add salt and pepper to taste and cook for another minute or two.  Remove from heat and set aside.  

Meanwhile, place 1/4 cup of horseradish sauce and 1/2 cup of mayonnaise in a small bowl and mix to combine.  Set aside. 

You can find horseradish sauce in the condiment aisle of your grocer store. 

Preheat your grill.  Pat dry two to four sirloin steaks, depending on the size of your family.  It is about one steak per sandwich.  Season generously with salt and pepper on both sides.  Grill about five to six minutes on each side, depending on the thickness of the steak and how you like it done.

  When cooked, allow the steaks to cool a bit and then slice the steaks really, really thin.

Slice it as thin as you can get it.

  Preheat the broiler of your oven.  Spread prepared horseradish mayo on French bread or sub rolls.  Place steak slices on the bread or rolls.

  Top with American cheese.

  Place under the broiler for one to two minutes to allow the cheese to melt, careful not to burn.  Top with caramelized onions and serve.

Grilled Sirloin Steak Sandwiches With Caramelized Onions and Horseradish Mayo The Garden of Yum
Printable recipe

2 tablespoons of butter
2 tablespoons of olive oil
3 large onions, thinly sliced
salt and pepper
1/4 cup of horseradish sauce
1/2 cup of mayonnaise
2 to 4 sirloin steaks, depending on how many sandwiches you want to make.  It is about one steak per sandwich.
American cheese to top sandwiches with
French bread or sub rolls

Heat butter and oil in a large saute pan on medium.  Add onions.  Cook on low heat for about 20-25 minutes stirring often until the onions are golden brown and soft.  Add salt and pepper to taste and cook for another minute or two.  Remove from heat and set aside.

In a small, mix together mayo and horseradish sauce.  Set aside. 

Preheat your grill.  Pat steaks dry with a paper towel and generously salt and pepper both sides.  Grill about five to six minutes per side, depending on how thick your steak is and how you like it done.  When cooked and cooled a bit, very thinly slice steak.  The thinner you can slice it the better.   Preheat  your oven broiler.  Spread prepared horseradish mayo on French bread or sub rolls.  Top with sliced steak.  Top with American cheese.  Place under broiler for a minute or two to melt the cheese.  Top with caramelized onions.  Enjoy!