While the bread was baking, I chopped a small onion and sautéd it in 4 tbsp of butter on medium heat for about 15 minutes in a medium sauce pan.
Once the onions were translucent and soft, I added 2 tsps of worcestershire sauce, a pinch of salt, ground pepper to taste, and 2 cups of chicken bone broth.
After all of the ingredients for the au jus sauce have been added and stirred. Add the slices of roast beef to the sauce pan one at a time so that the roast beef doesn't stick together.
Let the roast beef stew in the au jus for about 15 minutes. Gently turning/stiring the meat. The roast beef will turn from pink to brown, releasing flavors from the roast beef into the au jus sauce. Preheat the oven to 350F for melting the cheese on top of the sandwiches.
Slice the sourdough baguette loafs into equal hoagie lengths. I got 8 sandwiches from my simple same day sourdough baguettes.
Evenly divide the sliced roast beef, placing an even amount in each roll. Place 1 to 2 slices of your favorite cheese on top of the meat. I used Jarlsberg, one of our favorites.
Place the sandwiches on a baking sheet and warm in the oven until the cheese is melted.
Serve the sandwiches with a side of au jus sauce for dipping your French dip into. The au jus sauce yields enough sauce for 8 sandwiches.
I hope you enjoy these French dip sandwiches with au jus sauce as much as we did. Follow along @homesteadonlakeside for more homemade family inspiration and recipes.