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Home » Recipes » Beef Recipes

Leftover Prime Rib French Dip

Close up shot of a leftover prime rib French dip.
Easy to assemble and wonderfully flavorful, a leftover prime rib French dip sandwich is the best use of some wonderful leftovers.
Prep Time :5 minutes mins
Cook Time :30 minutes mins
Servings :2 people
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Published: Sep 23, 2024 · Modified: Jun 24, 2025 by Melanie Cagle · Leave a Comment

A fantastic use of leftovers, this tasty leftover prime rib French dip sandwich can be whipped up and served in 30 minutes. A perfect meal for the day after the holidays.

Leftover prime rib sandwich dipping into an au jus gravy.
Leftover Prime Rib French Dip

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Despite its name, the French dip sandwich is an American meal. Likely called French due to the bread used.

Typically a thinly sliced roast beef is used, hence using your leftover Prime Rib is the perfect way to use it.

Jump to:
  • What makes this recipe yummy
  • Groceries you'll need: ingredients
  • Recipe walkthrough: Instructions
  • Recipe variations and substitute ideas
  • Necessary gear: equipment
  • More recipes I think you'll love
  • How to store leftovers
  • Melanie Cagle
  • Mel's Kitchen Notes
  • Perfect pairings: what to serve with this recipe
  • Leftover Prime Rib French Dip
  • 💬 Comments

What makes this recipe yummy

Making an au jus gravy from the drippings when you roasted the prime rib makes this dipping sauce heavenly.

Cook the ribs with the gravy too, for even more flavor.

Groceries you'll need: ingredients

Overhead shot of the ingredients needed to make a leftover prime rib French dip.

See recipe card at the bottom of this post for quantities.

Recipe walkthrough: Instructions

This is an overview of the recipe steps. For more detailed instructions visit the recipe card at the bottom of this post.

A pan full of drippings from a prime rib roast.
Step 1: Add the drippings to a saucepan and cook over medium heat until melted.
Flour added to drippings in a pan.
Step 2: Add the flour and cook a few minutes.
Beef broth being poured into a pan with flour and drippings..
Step 3: Slowly add the beef broth, stirring constantly.
Leftover prime rib bones added to a sauce pan with some herbs.
Step 4: Add the ribs, thyme and seasonings, cover and cook for 30 minutes.
French bread cut in half and toasted.
Step 5: Toast your French Bread until golden brown.
A french bread loaded with grilled cheese and prime rib meat.
Step 6: Add sliced cheese on one half and sliced beef on the other. Grill again until cheese has melted.
Step 7: Close sandwich and serve with the gravy on the side.

Hint: Using the ribs is not crucial, but it adds great extra flavor and depth to the homemade au jus.

Recipe variations and substitute ideas

  • Hoagie Rolls - instead of French rolls.
  • Cheese ideas - Swiss Cheese, Gruyere, Provolone....
  • Caramelized Onions - who doesn't like this with their prime rib sandwich.
  • Garlic - sprinkle a little garlic powder into the gravy.
  • Rosemary - as well as the thyme.
A plate with a large Leftover Prime Rib sandwich, with a bowl of gravy on the side.

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Necessary gear: equipment

The following are affiliate links. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

You won't need much for this recipe. Just a saucepan for the au jus and a grill sheet for broiling the bread.

I have a couple of links in the recipe card below.

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How to store leftovers

It's best to not make the French dip sandwiches if you're unsure if it's eaten. Assemble as needed. They prime rib meat can always be stored in the refrigerator and the gravy reheated.

About The Author

Melanie Cagle

Melanie is a professional cook, food photographer and Cajun food connoisseur. Since 2020 she has been sharing rigorously tested recipes and tutorials right here on this blog.

Her work has been featured on Fox News channels, Yahoo news, Southern Living and more.

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Mel's Kitchen Notes

Try adding a little horseradish sauce to the sandwich before serving for even more flavors!

Close up of a prime rib sandwich.

Perfect pairings: what to serve with this recipe

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Close up shot of a leftover prime rib French dip.
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Leftover Prime Rib French Dip

Easy to assemble and wonderfully flavorful, a leftover prime rib French dip sandwich is the best use of some wonderful leftovers.
Prep Time5 minutes mins
Cook Time30 minutes mins
Servings: 2 people
Cuisine: American
Author: Melanie Cagle
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Equipment

  • Small Sauce Pan

Ingredients

  • 2 Tablespoons Prime Rib Drippings or butter
  • 2 Tablespoons All Purpose Flour
  • 3 Cups Beef Broth
  • ½ teaspoon Worcestershire Sauce
  • 1 teaspoon Salt
  • ½ teaspoon Black Pepper
  • 1 Sprig Fresh Thyme or 1 teaspoon dried thyme
  • 3 Each Leftover Ribs from the prime rib roast (optional)
  • 4 Ounces Leftover Prime Rib thinly sliced
  • 2 Loaves French Bread
  • 4 Ounces Cheddar Cheese sliced

Instructions

  • Add the prime rib drippings (or butter) to a small/ medium saucepan and apply medium heat.
    2 Tablespoons Prime Rib Drippings
  • Add the flour and cook for about 3 minutes.
    2 Tablespoons All Purpose Flour
  • Slowly pour in the beef broth while constantly stirring.
    3 Cups Beef Broth
  • Add the Worcestershire Sauce, salt and pepper, thyme and ribs (if you have them). Cover and simmer for 30 minutes. Remove the ribs from the pot, as well as the thyme stalks.
    ½ teaspoon Worcestershire Sauce, 1 teaspoon Salt, ½ teaspoon Black Pepper, 1 Sprig Fresh Thyme, 3 Each Leftover Ribs
  • Slice each French loaf in half, length ways. Spread a little butter on each half then toast under a broiler.
    2 Loaves French Bread
  • Lay slices of cheese on one half and some thinly sliced prime rib roast on the other half. Place under the broiler again for a few minutes, until the cheese has melted.
    4 Ounces Leftover Prime Rib, 4 Ounces Cheddar Cheese
  • Close the sandwich and serve next to a bowl of the Au Jus gravy you made in the beginning steps, to dip into.

Notes

The au jus gravy made here is a starting point, if you prefer your gravy with more of a kick go ahead and season it up to your liking.
I used a medium cheddar in these sandwiches, you could use many different varieties to your liking.
Did You Make This?Please consider Leaving a Review!

Nutrition

Serving: 1Sandwich | Calories: 583kcal | Carbohydrates: 8g | Protein: 26g | Fat: 49g | Saturated Fat: 23g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 17g | Cholesterol: 104mg | Sodium: 3526mg | Potassium: 388mg | Fiber: 0.3g | Sugar: 0.4g | Vitamin A: 593IU | Vitamin C: 1mg | Calcium: 433mg | Iron: 2mg

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Filed Under: Beef Recipes, Dinner Recipes, Lunch Recipes

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