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Italian Hot Beef Sandwich – Leftover Prime Rib Recipe

Leftover Prime Rib makes the BEST Hot Beef Sandwich. Piled high with tender, rare prime rib, crispy sauteed vegetables, Italian Seasonings, and melted cheese make this sandwich fit for a King!


Whole Italian sandwich with glistening buttered bun, loaded with rare prime rib, al dente vegetables and melted cheese.

Hot Beef Sandwich is the perfect way to repurpose leftover prime rib or roast beef. No one would ever know that your prime rib sandwich wasn’t the only meal you got from that beautiful prime rib dinner.

Leftovers don’t have to play second fiddle when they show up as an Italian Hot Beef Sandwich!

You’ve heard of dumpster diving, right? Well, I’ve been freezer diving! My freezer is so full that I’m getting claustrophobic just thinking about it.

I can stand in front of it and just stare and wonder where in the heck something is hiding. That drives my organized-loving brain crazy!

I’m determined to use up some of the things in my freezer. I’m always experimenting with new recipes but some of our favorite meals are repurposing leftovers.

I knew I had what was left of a prime rib roast from the holidays. John is a big “hot” sandwich guy. I decided that some of this beautiful prime rib was going to be Hot Beef Sandwiches.

John originally cooked this prime rib to perfection. It was rare and so juicy. I’d double wrapped it before putting it in the freezer and once thawed it looked just as pretty as when it went in.

I didn’t want to ruin it by overcooking it. Sauteing my veggies separately and only cooking the meat for 5 minutes under the broiler and then covering it all with a mound of seasoned veggies and cheese makes the tastiest Prime Rib Sandwich ever.

Italian Hot Beef Sandwich
Italian Hot Beef Sandwich

Prime Rib Sandwich Ingredients

Very basic ingredients that you probably already have on hand. When I buy my prime rib I’ll pick up the extra veggies because I know I’ll be making this prime rib leftover recipe.

  • Prime rib – thinly sliced. You can usually get rare sliced roast beef at your grocery store for a quick meal too.
  • Sautee veggies – I use green pepper, onion, and mushrooms. You can use what you enjoy.
  • Cheese – a semi-hard cheese that melts well but doesn’t turn to a liquid such as Havarti, Swiss or Mozzarella.
  • Italian blend seasoning.
  • Bread rolls – recommendations follow.
  • Olive oil

How to make an Italian Hot Beef Sandwich

4 photos showing the steps to make they hot beef sandwich, ingredients, oil on the bun, adding meat and vegetables and then cheese.
Steps for the perfect Italian Hot Beef Sandwich
  1. Sautee vegetables in a skillet over medium-high heat just until they start to soften.
  2. Drizzle slices of bread with olive oil and sprinkle with Italian seasoning.
  3. Assemble the sandwich by placing a thick layer of meat on the bottom slice of bread followed by a layer of sauteed vegetables. Place the cheese over the vegetables.
  4. Broil the bottom half of the sandwich only for 3 minutes. Add the top slice of the bread olive oil side up and broil and additional 2 minutes.
  5. Place the top of the bread on the sandwich and serve.

Tip: Placing the cheese over the top of the other ingredients and then broiling it with the top off melts the cheese better and allows the cheese to hold the other ingredients together.

Please note, that the printable recipe card has ingredient quantities, complete instructions, and nutritional information. The following is a quick overview of the recipe.

What other cuts of beef make great Hot Beef Sandwiches?

I’ve got to admit that I don’t always have a beautiful prime rib roast languishing in my freezer. More often it’s leftover roast beef. Rump roast or top round can be a tough, marbled piece of meat. When it’s roasted and thinly sliced it can make a delicious Hot Roast Beef Sandwich.

What is the best kind of bread for a Prime Rib sandwich?

This is totally your choice. I want an equal amount of bread to filling ratio. I feel ripped off when I can’t find the ingredients in my sandwich!

As you can see in this Italian Hot Beef Sandwich picture, the meat to bun is about equal.

Another consideration is to choose a bread that is soft enough to bite through but not so soft that the juices from the meat make it fall apart before you can take a bite.

Some suggestions would definitely be Medianoche if you are dipping into an au jus, Ciabatta, and Brioche if you aren’t.

Products that make this recipe easier to make

Skillet – I prefer stainless steel cookware. It allows me to see how my food is cooking and browning. It cleans up beautifully and is durable.

Knife – A good sharp carving knife with a thin blade.

Don’t forget to Pin this recipe to your favorite Sandwich Board!

Close up photo of a sandwich heaped with rare prime rib, sauteed vegetables and italian seasoning on a wooden cutting board. Title Italian Hot Beef Sandwich is printed under the photo.

Side dishes perfect for serving with a Prime rib sandwich

Tips and Variations for the best Prime Rib Sandwich

To slice prime rib thinly, it’s best to have a thin-bladed sharp knife. Also, the meat will slice easier if chilled. I’ll often put it in the freezer for 15 minutes so the outer surface holds up when pressure is applied.

Vegetables should be sliced thinly and sauteed quickly. They’re best if just al dente. You can use any combination of vegetables for your leftover prime rib sandwich but pick veggies that will sautee at the same rate.

I don’t overdo the cheese. Too much cheese will have your ingredients sliding around. You’ll want a good semi-hard cheese that will melt by the time your meat is warm.

I used an Italian blend of seasoning for this sandwich. My second choice would be a Mediterranean blend or a simple sprinkle of some oregano. Don’t overdo it.

Sandwich variations for this Prime Rib Sandwich from leftovers would be to use small buns for Prime Rib Sliders. You can also prepare an au jus and have a French Dip sandwich that would be so amazing.

We loved the Italian twist on this leftover Prime Rib sandwich. The quick cook time will allow you to get this delicious Leftover Prime Rib sandwich recipe on the table in a jiffy.

If you enjoyed this leftover Prime Rib recipe, here are a few more you may like!

Italian bread loaded with rare prime rib, Italian seasonings, melted cheese and al dente vegetables.

Italian Hot Beef Sandwich – Leftover Prime Rib Recipe

Author: Julie Menghini
That leftover Prime Rib or beef roast makes the best Italian Hot Beef Sandwich.  You may be making more roast beef just so you can make these sandwiches. 
5 from 9 votes
Prep Time 15 minutes
Cook Time 5 minutes
Total Time 20 minutes
Course Main Dish
Cuisine American
Keyword: Hot Beef Sandwich, Prime Rib Sandwich
Servings: 4 Sandwiches


  • 1 lb prime rib thinly sliced
  • 1/2 onion sliced
  • 1/2 green pepper sliced
  • 1 cup mushrooms sliced
  • 1 slice cheese mozzarella, swiss, havarti. or any melting cheese
  • 4 deli rolls or brat rolls
  • olive oil extra virgin
  • Italian spice blend


  • Preheat the oven to the broil setting.
  • Drizzle a skillet with extra virgin olive oil and heat on medium-high when hot add green peppers, onion, and mushrooms.  Cook until just al dente.
  • Assemble the sandwich by brushing the insides of the bread with extra-virgin olive oil and sprinkling with Italian herb seasoning.  Add meat to the bottom layer.  Top with the vegetable mixture and then top with cheese.  Place the bottom half of the sandwich only on a pan and broil for 3 minutes. 
  • Place the top of the roll under the broiler with the bottom, olive oil side up, and continue cooking for another two minutes. 
  • Remove from the oven and place the top of the roll onto the sandwich and serve immediately.


TIP: Placing the cheese over the top of the other ingredients and then broiling it with the top off melts the cheese better and allows the cheese to hold the other ingredients together.
The calories calculated for this sandwich are deli rolls. Calorie content will depend a lot on the bread rolls that you use.  


Calories: 553kcalCarbohydrates: 35gProtein: 24gFat: 35gSaturated Fat: 14gCholesterol: 76mgSodium: 389mgPotassium: 373mgFiber: 2gSugar: 6gVitamin A: 125IUVitamin C: 13.4mgCalcium: 69mgIron: 12.5mg

Nutritional Disclaimer

This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.

Tried this recipe?Let me know how it was!

Even after these Hot Beef Sandwiches from leftover prime rib were just a memory, we had enough prime rib for a new SIP recipe! What’s your favorite way to use leftover prime rib?

Recipe Rating


Wednesday 19th of December 2018

I need to remember to put mushrooms on my beef sammy.... This quick broil tip is so true!

Julie Menghini

Wednesday 19th of December 2018

Thank you, Michele! I just love mushrooms with beef recipes.


Tuesday 18th of December 2018

What an awesome sandwich! I might have to make this for dinner tomorrow night!

Julie Menghini

Wednesday 19th of December 2018

Thank you, Madi! I hope everyone enjoys it!

Michaela Kenkel

Monday 17th of December 2018

That is quite possibly the world's most perfect sammie!

Amy Nash

Monday 17th of December 2018

These are the most delectable looking leftovers ever. I want to make prime rib now just so I have leftovers for this sandwich, lol!

Sandra Shaffer

Monday 17th of December 2018

Oooh, you have the best stash in your freezer. The beef looks so tender and with that cheese it's a perfect sandwich!

Julie Menghini

Tuesday 18th of December 2018

Thank you! I need to start eating up my freezer. I think it's at capacity!

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