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.

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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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!

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22 Responses to “Roast Beef, Caramelized Onion, Havarti, and Arugula Sandwich on a Focaccia Roll”

  1. 1

    Rhonda — July 17, 2012 @ 8:58 pm

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

    [Reply]

  2. 2

    bellini — July 17, 2012 @ 8:59 pm

    My kind of sandwich!!

    [Reply]

  3. 3

    Smokin Don — July 17, 2012 @ 10:07 pm

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

    [Reply]

  4. 4

    Kris — July 17, 2012 @ 10:08 pm

    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!!!

    [Reply]

  5. 5

    Carmen Rosa — July 18, 2012 @ 1:30 am

    Good morning Pam……This sandwich looks delicious!!!!!

    [Reply]

  6. 6

    Diane — July 18, 2012 @ 4:08 am

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

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  7. 7

    Jenn's Food Journey — July 18, 2012 @ 5:30 am

    I wish I could take that sandwich to lunch with me today…….. It looks mouthwatering!!!

    [Reply]

  8. 8

    Jenny Eatwell — July 18, 2012 @ 9:13 am

    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. :)

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  9. 9

    Transportation Services Houston — July 18, 2012 @ 9:25 am

    I’m with Jenny… this made my mouth water when I saw this!!!

    [Reply]

  10. 10

    Kim in MD — July 18, 2012 @ 10:27 am

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

    [Reply]

  11. 11

    Chung-Ah | Damn Delicious — July 18, 2012 @ 11:02 am

    Oh man you have no idea how badly I want this sandwich for lunch today!

    [Reply]

  12. 12

    Blond Duck — July 18, 2012 @ 2:37 pm

    I’m glad you’re back!

    [Reply]

  13. 13

    Cathy at Wives with Knives — July 18, 2012 @ 4:03 pm

    That’s my idea of the perfect sandwich. Hi Pam – I hope you had a wonderful vacation.

    [Reply]

  14. 14

    Joanne — July 18, 2012 @ 5:41 pm

    You are making seriously good use of those leftovers!

    [Reply]

  15. 15

    The UDG — July 18, 2012 @ 8:39 pm

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

    [Reply]

    • Pam replied: — July 18th, 2012 @ 8:45 pm

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

      Cheers,
      Pam

      [Reply]

  16. 16

    Words Of Deliciousness — July 18, 2012 @ 9:45 pm

    I would love to have one of these sandwiches. It looks so yummy!

    [Reply]

  17. 17

    Angie@Angie's Recipes — July 19, 2012 @ 3:04 am

    The sandwich looks so good!

    [Reply]

  18. 18

    grace — July 20, 2012 @ 8:12 am

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

    [Reply]

  19. 19

    Chris — July 20, 2012 @ 4:19 pm

    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!

    [Reply]

  20. 20

    health — July 23, 2012 @ 4:19 am

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

    [Reply]

  21. 21

    Kristen — July 24, 2012 @ 9:42 am

    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!

    [Reply]

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