Looking for a delicious way to use up leftover roast beef? This Roast Beef Sandwich with cheddar cheese on a toasted brioche bun is the perfect solution! As a professional chef, we can tell you that this sandwich isn’t just a way to repurpose leftovers—it’s a restaurant-worthy meal that’s packed with flavour.
Whether you need a quick dinner on a busy weeknight or a satisfying lunch, this sandwich delivers big on taste and ultimate satisfaction.
The History of the Roast Beef Sandwich
Hot beef sandwiches have long been a comfort food staple, with roots tracing back to early diners and delis in the United States. Known for their rich, satisfying flavours, they became a go-to meal for anyone craving a hearty, filling bite. Our version takes this classic up a notch, using a buttery brioche bun and sharp cheddar to create a gourmet experience in just minutes.
How to Make the Best Roast Beef Sandwich
Ingredients:
- 1/2 – 3/4 lb cooked roast beef, thinly sliced
- 2 Tbsp butter (+ more for toasting the buns)
- 1 medium onion, julienned
- 2 Tbsp all-purpose flour
- 2 cups good-quality beef stock
- 1 cup grated cheddar cheese (or your favorite cheese)
- Salt & pepper to taste
- 4 brioche buns
- Mayonnaise (optional, for spreading on the bun)
Step 1: Caramelize the Onions
Preheat a frying pan over medium heat. Add butter and julienned onions, stirring to coat. Season generously with salt. Let the onions cook undisturbed for a few minutes to develop deep caramelization. Stir occasionally and continue cooking until soft and golden brown.
Step 2: Make the Onion Pan Gravy
Sprinkle the flour over the caramelized onions, stirring to coat evenly. Cook for about 30 seconds to a minute to remove the raw flour taste. Gradually add beef stock, whisking continuously to create a rich, smooth gravy. Let it simmer for 3-4 minutes until thickened. Adjust the consistency with a bit of water if needed. Season to taste.
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Step 3: Toast the Brioche Buns
Preheat a pan over medium heat. Butter the inside of the brioche buns and place them butter-side down in the pan until golden brown and slightly crisp.
Step 4: Assemble the Sandwich
- Spread mayonnaise on the bottom bun (if using).
- Layer on the sliced roast beef and season with salt and pepper.
- Top with a generous amount of shredded cheddar cheese.
- Spoon the rich onion gravy over the cheese, letting it melt into the sandwich.
- Cap it with the toasted brioche top and serve immediately.
Chef’s Pro Tips for the Perfect Roast Beef Sandwich
- Use high-quality beef stock – It makes all the difference in the flavour of the onion gravy.
- Slice roast beef thinly – This ensures tender, easy-to-bite layers in your sandwich.
- Don’t skip toasting the bun – That golden, buttery crispness elevates the entire experience.
- Let the cheese melt naturally – The heat from the beef and gravy should do the trick!
Love Roast Beef? Learn to Make It From Scratch!
Want to make the best roast beef for your sandwiches? Join our Roast Beef & Yorkshire Pudding Cooking Class and learn from professional chefs how to prepare this dish perfectly every time!
This Roast Beef Sandwich is a must-try for any sandwich lover. With tender beef, melty cheddar, and rich onion gravy on a toasted brioche bun, it’s the perfect balance of comfort and indulgence. Give it a try, and let us know how it turns out!
