Roast Beef Sandwich

🧂 Ingredients

• 3 tablespoons unsalted butter
• 2 1/2 tablespoons all purpose flour
• 1 1/4 cups milk
• 1 1/2 teaspoons dijon mustard
• 1/2 teaspoon salt
• 6 ounces shredded sharp cheddar cheese
• 1 recipe easy roast beef, thinly sliced
• 3 sesame topped burger buns

👨‍🍳 Instructions

1. 1

   Place a pot over medium heat and melt butter.

2. 2

   Once butter has melted, add flour and whisk until no lumps remain.

3. 3

   Whisk milk, mustard and salt into mixture and continue to whisk together until mixture is smooth and no lumps remain, and mixture has slightly thickened.

4. 4

   Remove mixture from heat and stir in grated cheese, small handfuls at a time, until all cheese has been added and cheese sauce is smooth.

5. 5

   Stack a third of the roast beef onto the bottom bun of each burger. Pour a generous amount of cheese sauce over each sandwich and gently press bun tops onto each sandwich. Serve immediately.