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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 garlic-crusted roast beef so I made this roast beef, caramelized onion, havarti, and arugula sandwich recipe. My husband and I loved these sandwiches and thought they paired nicely with potato salad and fresh fruit.

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

Ingredients:

  • 1 tbsp butter or olive oil
  • 1 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

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

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

Preheat the oven to 350 degrees.

Melt the butter in 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 or two of water.

Place the sliced focaccia bread directly on the rack in the oven and toast for about 3-5 minutes.

Slice the leftover roast beef into thin slices.

Spread mayonnaise and horseradish mustard, to taste, on the toasted roll.

Place the roast beef on the bottom bun then top with a slice of Havarti.

Place back in the oven and cook until the cheese melts, about 3-4 minutes.

Remove the sandwich from the oven and place a large spoonful of caramelized onions on top of the melted cheese.

Add the arugula and place the remaining half of the roll on top.

Serve immediately.  Enjoy!

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

Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Course: Lunch, Main
Cuisine: American
Servings: 4

Equipment

Ingredients

  • 1 tbsp butter or olive oil
  • 1 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.
  • Melt the butter in 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 or two of water.
  • Place the sliced focaccia bread directly on the rack in the oven and toast for about 3-5 minutes.  
  • Slice the leftover roast beef into thin slices.  
  • Spread mayonnaise and horseradish mustard, to taste, on the toasted roll.  
  • Place the roast beef on the bottom bun then top with a slice of Havarti.  
  • Place back in the oven and cook until the cheese melts, about 3-4 minutes.
  • Remove the sandwich from the oven and place a large spoonful of caramelized onions on top of the melted cheese.
  • Add the arugula and place the remaining half of the roll on top.
  • Serve immediately.  Enjoy!
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22 Comments

  1. 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!!!

  2. 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. 🙂

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

      Cheers,
      Pam

  3. 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!

  4. 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!