Super Easy Roast Beef Sandwich Recipe - Love Your Leftovers!

It's easy to love your leftovers with this cold roast beef sandwich! The perfect recipe for leftover roast beef.

If you've made a Sunday roast and you've got leftover roast beef in the fridge, making a really tasty sandwich is a great way to squeeze another meal out of the beef joint.

I usually serve these up with some quick air fryer roast potatoes and a pot of gravy for dunking them... I can't help myself (and you should definitely try it)

Why You'll LOVE This Leftover Roast Beef Recipe

Avoids waste - using your roast beef leftovers is a great way to save money and reduce your food waste.

Super tasty - mmmm sliced home cooked roast beef on buttery baguette is nothing but good!

Quick meal idea - when you're short on time, throwing together a quick and easy sandwich is simple, and satisfying.

Roast Beef Sandwich Recipe

Serves – 1 (easily doubled/tripled)

Prep Time – 5 minutes 

Cook Time – no cooking needed

Total Time – 5 minutes

Our Most Popular Alternative – New York Pastrami Sandwich

Equipment Needed

• Chopping board

• Bread knife

• Tablespoon

• Teaspoon

Roast Beef Sandwich Ingredients 

You'll just need a handful of ingredients to make this tasty beef sandwich recipe

• Small sandwich baguettes - or swap this for soft white bread, crusty cob, sourdough, soft buns, cheese bread - whatever bread you like to eat.

• Salted butter - salted just tastes so good with beef.

• Thin slices of cold roast beef - if you want to make these and don't have roast beef leftovers, buy some deli roast beef slices instead.

• Mix of salad leaves - spinach, rocket or watercress 

• Red onion - sliced into moons

• Mayonnaise

• Dijon mustard - you could use horseradish sauce instead.

For full protein, carbohydrates, calories and nutrition information see recipe card below

How To Make The BEST Roast Beef Sandwich - Step-By-Step Instructions 

Step One - butter the baguette

• Split open the baguette and spread with butter.

Step Two - add the sandwich fillings

• Layer on the salad leaves

• Add the roast beef slices

• Top with sliced red onions

Step Three - add the dressing

• Mix the mayonnaise and mustard together in a small bowl, then drizzle onto the roast beef and onions. Season with salt and black pepper if using.

Step Four - serve

• Sandwich together and serve.

Serving Suggestions

Roast beef sandwiches go great with a few different sides, just pick your favourite or a mixture of a few and enjoy!

• Roast potatoes and gravy dip

• French fries with mustard mayonnaise

• Kettle crisps

• Tangy coleslaw

• Garden salad

• Bowl of pickled onions or cornichons

Get loads more lunch ideas here

More Roast Beef Sandwich Ideas 

Well... this is your roast beef sandwich, if you fancy some extras add them on! Try adding in a mature cheddar cheese, some horseradish sauce, some dill pickle slices, potato salad. Anything you like to eat!

Recipe Tips And Frequently Asked Questions

What is the best cut of beef for roast beef sandwiches?

Top Rump or Topside are the best cuts of beef for roast beef dinner (and leftover beef sandwiches)

What condiment goes on roast beef sandwich?

Condiments that work well are English mustard, Dijon mustard or creamy horseradish sauce. You can mix these with mayonnaise to make a mustard mayo or horseradish mayo.

What kind of cheese goes with beef?

Cheese and beef on a baguette are delicious together. Try mature cheddar, blue cheese, provolone cheese or even a thick layer of cream cheese (one flavoured with herbs)

How long is a roast beef sandwich good for?

These sandwiches should be eaten within a day of making (and before the use-by date of any ingredients used) Keep the sandwich in an airtight container in the fridge.

Extras to add to a roast beef sandwich

You can add some tasty extras to your sandwich. Try your favourite cheeses, sliced tomatoes, lettuce, aioli or caramelized onions.

Looking For Some Family Meal Ideas?

Check out our meal planning here – it’s filled with recipes, meal planning tips and pre-filled printable meal plans weekly or seasonally. We’ve got hundreds of the BEST family recipes and family meal ideas your whole family will LOVE!

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