Toasted Roast Beef and Swiss Cheese Sub Sandwich

This toasted roast beef and Swiss cheese sub sandwich is quick and easy to make. It consists of 5 ingredients, including shaved deli roast beef.

What you need:

• 1 loaf fresh French bread
  
• 1 lb deli roast beef, shaved
  
• 10 slices Swiss cheese
  
• 1/4 c Dijon-style mustard
  
• 3-4 T butter, softened
  

What you do:

• Preheat oven to 325 degrees.