Have leftover pork roast and need a tip on how to use it up? Make a delicious grilled pork tenderloin sandwich with mozzarella and caramelized onions!Have leftover pork roast and need a tip on how to use it up? Make a delicious grilled pork tenderloin sandwich with mozzarella and caramelized onions!
Ever have leftover pork roast or pork tenderloin and wonder what you can do to use it up creatively?  Recently I had leftover pork from dinner, so I made a Grilled Pork Tenderloin Sandwiches with Mozzarella and Caramelized Onions for lunch!  It tasted wonderful!

I enjoy having leftovers in the fridge, unlike my little sister Joni, who hates having them around. My personal theory is it’s awesome when you can cook once, then take some of the leftovers and “morph” them into a completely different meal.  That was how this sandwich came into existence.

I was looking for something in our refrigerator for lunch, but didn’t want to have leftover pork… unless I could transform it into something else!  So… I put my thinking cap on and came up with the idea for this pork tenderloin sandwich!  Here’s how to make it:

Caramelize The Onions

Cook the sliced onions slowly in a skillet with a bit of olive oil for several minutes. Continue to cook until the onions have browned and caramelized.

Sliced onions are caramelized in skillet before adding to sandwich.

“Build” The Pork Tenderloin Sandwich

Melt the butter in a large skillet on medium-low heat.  Butter one side of a large piece of sourdough bread and place it butter side DOWN in skillet.

Generously layer the bread with thin slices of leftover cooked pork tenderloin. If necessary, lightly season the pork slices with salt and pepper.

Thin slices of pork tendeloin are arranged on buttered bread in skillet.
Arrange the caramelized onions on top of the pork slices.

Caramelized onion slices are added to the pork tenderloin sandwich.
Spread a thin layer of sliced mozzarella (or grated) on top of the onions.

Mozzarella cheese slices are placed on top of the caramelized onions.

Butter one side of the other pieces of sourdough bread, and place them on top of the sandwich, butter side UP.

Time To Cook The Grilled Pork Tenderloin Sandwich

Cook the sandwich on medium-low heat until the bottom side of the bread has lightly browned.

The pork tenderloin sandwich is grilled in a skillet.
Carefully turn sandwich over and cook the other side (like a grilled cheese sandwich).  See how nice and golden brown the sourdough bread is now?

Continue cooking slowly until cheese has melted. You want the grilled pork tenderloin sandwich to be heated all the way through (low and slow!).

The pork tenderloin sandwich is flipped to other side once golden and toasted.

When the sandwich is done cooking, remove it from the skillet. Transfer it to a plate, and get ready to enjoy this sandwich!

It’s Time To Eat The Grilled Pork Tenderloin Sandwich!

Carefully cut the grilled sandwich in half… and enjoy!  The tender pork slices, crunchy buttery sourdough bread, gooey melted mozzarella cheese and slight sweetness of the caramelized onions really make this sandwich special.

An entire grilled pork tenderloin sandwich is very filling! A half of this sandwich was all I could eat! If you don’t want to eat a whole sandwich, you can get 4 servings when you make two sandwiches.

The grilled pork tenderloin sandwich, cut in half to serve.

Hope you will consider creating a delicious pork tenderloin sandwich when you have leftover pork roast or tenderloin!  The sandwich was very good!

Looking For More SANDWICH Recipes?

You can find all of my sandwich recipes in the Recipe Index, located at the top of the page. A few of them include:

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Grilled Pork Tenderloin Sandwich w/ Mozzarella & Caramelized Onions
Prep Time
10 mins
Cook Time
10 mins
Total Time
20 mins
 

Have leftover pork roast and need a tip on how to use it up? Make a delicious grilled pork tenderloin sandwich with mozzarella and caramelized onions!

Category: Sandwich
Cuisine: Sandwich
Keyword: pork tenderloin sandwich
Servings: 2 servings
Calories Per Serving: 666 kcal
Author: JB @ The Grateful Girl Cooks!
Ingredients
  • 4 slices sourdough bread
  • 1 Tablespoon butter (for skillet)
  • 2 Tablespons enough butter to spread on bread (for grilling)
  • 8 thin slices precooked pork tenderloin (enough to cover each sandwich)
  • 1/2 onion , thinly sliced
  • 1 Tablespoon olive oil
  • thin slices mozzarella cheese (enough to cover sandwich)
Instructions
  1. Heat olive oil in skillet on medium heat. Add sliced onions; cook slowly, stirring occasionally, for several minutes, until they have browned and caramelized.
  2. Melt butter in a skillet on medium-low heat. For each sandwich, butter one side of bread and place it butter side DOWN in skillet.
  3. Cover bread with thin slices of leftover cooked pork tenderloin. Lightly season pork with salt and pepper. Divide and spread caramelized onions on top of pork. Spread a thin layer of sliced mozzarella (or grated) on top of onions. Butter one side of remaining pieces of sourdough bread, and place on top of the sandwich, butter side UP.

  4. Cook on medium-low until bottom side has lightly browned.Carefully turn sandwich over. Continue cooking slowly until cheese has melted and sandwich is heated through (low and slow!). When sandwiches are done cooking, remove from skillet. Slice sandwich in half... and enjoy!

Nutrition Facts
Grilled Pork Tenderloin Sandwich w/ Mozzarella & Caramelized Onions
Amount Per Serving (1 sandwich)
Calories 666 Calories from Fat 207
% Daily Value*
Fat 23g35%
Saturated Fat 9g56%
Cholesterol 88mg29%
Sodium 932mg41%
Potassium 524mg15%
Carbohydrates 75g25%
Fiber 3g13%
Sugar 4g4%
Protein 37g74%
Vitamin A 365IU7%
Vitamin C 2.1mg3%
Calcium 206mg21%
Iron 5.5mg31%
* Percent Daily Values are based on a 2000 calorie diet.

Here’s one more to pin on your Pinterest boards!Have leftover pork roast and need a tip on how to use it up? Make a delicious grilled pork tenderloin sandwich with mozzarella and caramelized onions!

 

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Grilled Pork Tenderloin Sandwich with Mozzarella and Caramelized Onions

12 Comments on Grilled Pork Tenderloin Sandwich with Mozzarella and Caramelized Onions

  1. I had half of a pork tenderloin leftover and was looking for a new recipe to use it. Made this for dinner tonight. It was delicious. Thanks for the recipe.

    • We 💓 this sandwich. I used rye bread and it was fantastic!!! Hubby said he has had lots of specialty sandwiches in his working years and this topped ’em all!!!

      • Hi, Sharon… glad the sandwich was enjoyed. I LOVE the idea of using rye bread… yum. Gonna have to try that! Sorry for my late response. Been PLOWED with comments, and am slowly working through them all.

  2. Wonderful sandwich! I removed my sautéed onions added more butter to the pan and threw in my thinly sliced leftover pork tenderloin to warm it a bit. Always hated leftover pork tenderloin…..

    • Good morning, Kimme, and thank you for writing! I am so glad you enjoyed the sandwich. I am right there with ya on the leftover pork tenderloin thing… ha ha! Take care, and have a good day.

    • Good morning, Rex! Thank you for taking time to write a note about this sandwich! You are right… it is a good sandwich and is easily prepared. Have a GREAT weekend.

  3. that sounds so freakin delicious! I have everything except the sourdough bread but I’m gonna find a substitute lol. I never know what to do with leftover pork and it’s hard to reheat without ruining it.

    • Hey, Marie… thanks for taking time to write a quick note! Hope you enjoy the sandwich! You are completely right… it is definitely hard to reheat pork without “ruining” it. Have a GREAT day!

    • Ooh… smoked Gruyere would taste FANTASTIC on this sandwich! Thank for writing, and thanks for the suggestion, Cleveland! Have a great day!

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