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Roast Beef Sandwich | Bottom Left of the Mitten

Roast Beef Sandwich

This is not your average Roast Beef Sandwich. It's a big, bold sandwich filled with roast beef, mushrooms, onions, and bacon. Slather with a blue cheese spread for the ultimate in sandwiches.
Course Main Dish
Cuisine Beef, Food to Drink to, Sandwich
Keyword beef, sandwich
Prep Time 10 minutes
Cook Time 15 minutes
Total Time 25 minutes
Servings 6 servings


  • 1 loaf Italian bread
  • 1 pound bacon
  • 1 pound cooked roast beef from the deli area
  • 8 ounces white mushrooms cleaned and sliced
  • 1 large yellow onion chopped
  • 1-1/2 Tbs butter
  • 1/2 cup mayo
  • 1/4 cup horseradish sauce
  • 1/4 cup blue cheese crumbles
  • lettuce and tomato for topping


  • Start by cooking the bacon. Cook for about 6 minutes then turn and cook for an additional 6-8 minutes.
  • Take the loaf of bread and cut it in half. Spread with butter and place face down on a cookie sheet. Put into a preheated 350-degree oven and let it toast up for about 5-8 minutes.
  • Once the bacon is done remove it from the pan and put on a plate with paper towels to allow it to drain. Remove all the grease in the pan from the bacon reserving about 1-2 tsp.
  • Add 1 Tbs of butter to that then add the sliced mushrooms and onions. Let those cook down for about 5 minutes. Then add the roast beef.
  • While those cook flip the bread over and spread the cheese equally on each side. Put back into the oven and let the cheese melt, around 5 minutes.
  • Now make the sauce which is just mixing the blue cheese, mayonnaise and horseradish sauce together.
  • Crumble the bacon and add to the cooked roast beef.
  • Take the bread out of the oven then pile it high onto one side of the bread then top off with the other. Cut into 6 pieces then serve. Let others add lettuce, tomatoes, and the blue cheese mixture as they like. Enjoy!