This authentic Chicago-style Italian Beef Sandwich is made with thin slices of juicy roast beef simmered and served au jus on a French roll with hot cherry peppers and giardiniera. So tender and flavorful, this easy dinner recipe is a family favorite.
Heat the oil in a large pot or Dutch oven until it starts to shimmer. Sear the roast on all sides for 4-5 minutes per side until all sides start to brown and crisp.
Remove the roast from the pot and set aside. Add the garlic, onion, pepperoncini, sugar, salt, parsley, basil, oregano, thyme, chili flakes, pepper, and beef broth and stir to combine.
Return the roast to the pot, placing it on top of the onion and seasonings, then cover with an off-set lid. Place it in the oven and roast for 4 hours, or until a fork easily pierces through the meat. (Turn the roast over every hour to ensure even cooking.) Remove from the oven.
(Optional) Allow the roast to cool to room temperature (around 1 ½-2 hours) before covering with a lid and refrigerating overnight.
Remove the pot from the refrigerator and transfer the beef to a large cutting board. Strain the broth through a fine-mesh strainer into a large pan or skillet (if the broth has congealed due to cooling, reheat on the stovetop until warm, then proceed with straining.) Meanwhile, thinly slice the beef using a meat slicer or sharp knife.
Bring the broth (au jus) to a simmer over medium heat. Add the slices of beef to the broth and simmer gently for 30 minutes.
To assemble the sandwiches, layer the beef into the sliced buns and drizzle with a spoonful or two of au jus, then add a few spoons of the Giardiniera on top, followed by a spoonful of the sweet peppers.
Serve with the au jus in small ramekins or bowls for dunking.
Notes
Store leftover sliced beef and au jus in an airtight container in the refrigerator for up to 5 days.