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Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

I had leftover roast beef from my Garlic Crusted Roast Beef that I made recently so I decided to make some tasty sandwiches.  I was inspired to make this sandwich after I saw a delicious sandwich on Kevin’s Closet Cooking.  I used what I had on hand and it turned out amazing.  I recently picked up a delicious horseradish mustard from a local farm that went perfectly with the roast beef and arugula.  I loved the sweet caramelized onion and the flavorful Havarti combined with the tender beef and focaccia roll.  My husband and I really loved these sandwiches and gobbled them right up.

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

Preheat the oven to 350 degrees.

Place the olive oil into a large skillet over medium heat.  Add the sliced onions and cook, stirring often, for 20-30 minutes, or until caramelized and golden brown.  Season with sea salt, to taste.  Side Note: If the skillet gets dry, add a tablespoon of water or two.

Place the sliced focaccia bread into the preheated oven and let the roll warm up, about 3-5 minutes.  Slice the leftover roast beef into thin slices.  Remove the roll from the oven and spread mayonnaise and horseradish mustard, to taste.  Place the roast beef onto the bottom bun then top with a slice of Havarti.  Place back into the oven and cook until the cheese melts, about 3-4 minutes.

Remove the sandwich from the oven.  Place a large spoonful of caramelized onions on top of the melted cheese then add the arugula and finally place the remaining half of the roll on top.  Serve immediately.  Enjoy!

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

 

 

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

 

Yield: 4

Prep Time: 10 min.

Cook Time: 30 min.

Total Time: 40 min.

Ingredients:

1 tbsp olive oil
1 sweet yellow onion, sliced thinly
Sea salt, to taste
1-2 tbsp water, if needed
Focaccia rolls, sliced in half
Horseradish mustard, to taste
Mayonnaise, to taste
Roast beef, thinly sliced
Havarti cheese slices
Arugula

Directions:

Preheat the oven to 350 degrees.

Place the olive oil into a large skillet over medium heat. Add the sliced onions and cook, stirring often, for 20-30 minutes, or until caramelized and golden brown. Season with sea salt, to taste. Side Note: If the skillet gets dry, add a tablespoon of water or two.

Place the sliced focaccia bread into the preheated oven and let the roll warm up, about 3-5 minutes. Slice the leftover roast beef into thin slices. Remove the roll from the oven and spread mayonnaise and horseradish mustard, to taste. Place the roast beef onto the bottom bun then top with a slice of Havarti. Place back into the oven and cook until the cheese melts, about 3-4 minutes.

Remove the sandwich from the oven. Place a large spoonful of caramelized onions on top of the melted cheese then add the arugula and finally place the remaining half of the roll on top. Serve immediately. Enjoy!

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll

Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 4

Ingredients

  • 1 tbsp olive oil
  • 1 sweet yellow onion sliced thinly
  • Sea salt to taste
  • 1-2 tbsp water if needed
  • Focaccia rolls sliced in half
  • Horseradish mustard to taste
  • Mayonnaise to taste
  • Roast beef thinly sliced
  • Havarti cheese slices
  • Arugula

Instructions

  • Preheat the oven to 350 degrees.
  • Place the olive oil into a large skillet over medium heat. Add the sliced onions and cook, stirring often, for 20-30 minutes, or until caramelized and golden brown. Season with sea salt, to taste. Side Note: If the skillet gets dry, add a tablespoon of water or two.
  • Place the sliced focaccia bread into the preheated oven and let the roll warm up, about 3-5 minutes. Slice the leftover roast beef into thin slices. Remove the roll from the oven and spread mayonnaise and horseradish mustard, to taste. Place the roast beef onto the bottom bun then top with a slice of Havarti. Place back into the oven and cook until the cheese melts, about 3-4 minutes.
  • Remove the sandwich from the oven. Place a large spoonful of caramelized onions on top of the melted cheese then add the arugula and finally place the remaining half of the roll on top. Serve immediately. Enjoy!
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22 Comments

  1. I love that Trader Joes lite havarti! This sandwich looks delicious.

  2. Pam I sure liked the garlic crusted beef and this is a tasty looking use of it! I like using caramelized onions too! Don

  3. Oh wow, that looks good! We love havarti cheese and putting arrugula on sandwiches. Such a nice peppery bite it has! I put it on pizza all the time too.
    Oh gosh, I am in bed and may have to get up and go have a snack! Look what you do to me Pam!!!!
    XO Kris
    PS You can come to my house and swim, any old time. And I will send you home with avocados and all sorts of goodies!!!

  4. This looks delicious, we never make dishes like that here, perhaps it is time I tried. 🙂 Diane

  5. I just had to come and see the photographs, as the description sounded To.Die.For. Sure enough, it looks as good as it sounds. I particularly love Havarti cheese and the idea of putting it together with roast beef just has my mouth watering. 🙂

  6. Kim in MD says:

    Yum…what a great sandwich to make with your roast beef leftovers!

  7. You are making seriously good use of those leftovers!

  8. The focaccia bread is calling to me. What do you think good substitutes for the roast beef would be??

    1. I am sure ham, turkey, or chicken would work great on this sandwich as well. I hope this helps.

      Cheers,
      Pam

  9. i love every component of this, pam! i realize now that i don’t eat enough havarti. 🙂

  10. Beef and havarti, a perfect match! I KNEW there was going to be a roast beef sandwich after seeing that roast:)

    Hope you guys are having a great weekend!

  11. I like this type food…………….its looking yummy

  12. I made these sandwiches this past weekend and they were so good. I just love this blog and always coming to it for great ideas. Thank you!