3 months ago

Grilled Steak &
Onion Sandwiches with Creamy Horseradish Sauce

A great way to
use leftover steak! Twin Cities food blogger
greens & chocolate shares her go-to steak sandwich

While we are more burgers-and-brats type of
people when it comes to grilling (and give me ALL the sides!), we do like to
grill steaks a few times a summer. Paired with some grilled onions and
mushrooms, an ear or two of corn on the cob and an ice cold beer … and I am one
happy lady.  

Since I tend to overdo it on the sides, I
pretty much always have leftover steak. I’m definitely not one to waste a good
piece of meat, but leftover steak on its own just doesn’t have quite the same appeal
as the juicy, pink-in-the-middle steak that comes straight off the grill.  

Enter the steak sandwich. Leftover steak is
ideal for a steak sandwich because the key to a good steak sandwich is getting
super thin slices of steak. When you cut the steak cold, it’s a lot easier to
get thinner slices than when it’s hot. Another pro tip: cut the steak against
the grain.  

That said, these Grilled Steak & Onion
Sandwiches with Creamy Horseradish Sauce were still 100% delicious with freshly
grilled steak. The slices were just cut a little thicker than ideal. I’ve
included directions on grilling the steak and onions, which is all very
straightforward, but feel free to use any leftover steak you might have.  

The star in these sandwiches is definitely
the creamy horseradish sauce. I used to be one of those people who “didn’t
like horseradish” but really didn’t know what they were talking about. I
also used to dip my steak in ketchup. Please forgive me. I’ve come a long way
since those days.  

Anyway, this creamy horseradish dip is
pretty much your steak’s new best friend. It’s SO good and SO easy. The base of
the sauce is plain yogurt, but you can use sour cream if you want. To the yogurt
I added a spoonful of mayo, some garlic, fresh horseradish and some salt and
pepper … and holy smokes, was it good!  

A generous smear of the horseradish sauce
on a lightly-toasted bun, topped with thinly-sliced steak, grilled onions and
some arugula makes for one seriously delicious steak sandwich!


Grilled Steak &
Onion Sandwiches with Creamy Horseradish Sauce

Makes 4 sandwiches

For the Creamy
Horseradish Sauce:

  • ½ cup plain yogurt
  • 2 tablespoons mayonnaise
  • 1 tablespoon horseradish
  • 2 cloves garlic, minced
  • ¼ teaspoon salt
  • ¼ teaspoon pepper

For the Steak

  • 2 (12-16 ounce) sirloin steaks
  • Your favorite steak seasoning
  • 3 tablespoons olive oil
  • 2 yellow onions, thinly sliced
  • 4 ciabatta buns
  • Butter, for the buns
  • Arugula, for topping


1.     Make the horseradish
sauce by combining all sauce ingredients and stirring well to combine.  Cover and let sit in refrigerator until ready
to use.

2.     Heat grill to
medium-high heat.  

3.     Season steak with
steak seasoning. Lightly brush with 1 tablespoon of olive oil. Let sit at room
temperature for 20 minutes.

4.     Meanwhile, toss onions
with additional 2 tablespoons olive oil and season them with salt and pepper.

5.     Place onions in a
grilling pan or wrap in foil. Place on grill and cook until onions are softened
and beginning to caramelize, about 25 minutes.

6.     Once steak has sat at
room temperature for 20 minutes, place on grill.

7.     Cook for 4-5 minutes,
until steak is golden and has grill marks, and then flip. For medium-rare, cook
until internal temperature reaches 140 F (another 3-4 minutes); for medium,
cook until 150-155 F (another 5-6 minutes); and for medium-well cook until
160-165 F (another 6-7 minutes).  This
always depends on the thickness of your steak. To be sure, use a meat

8.     Let your steak rest
for 3 minutes before slicing.

9.     While steak is
resting, butter the buns.

10.  Place bun halves on
grill, butter side down, and lightly grill for 1-2 minutes. Keep a close eye on
them, as they will burn easily.

11.  Once steak has rested,
cut it as thinly as possible.

12.  Place approximately 2
tablespoons of spread on the bottom half of each bun.

13.  Top with steak and

14.  Top with arugula and
finally the top half of the bun. Serve and enjoy!