1. Brown the beef by heating a drizzle of oil in a large sauté pan. Working in batches, add a few pieces of beef to the pan and brown on all sides. When browned, transfer to the crock of a slow cooker. Repeat with remaining beef. Place carrots and mushrooms in with the beef.
2. Add onion to the pan you browned the beef in. Stir to scrape up any browned bits. Add balsamic, Dijon, and broth to the pan and stir until well combined. Pour the whole mixture into the slow cooker over the beef, carrots, and mushrooms. Place rosemary on top.
3. Cook stew in slow cooker on HIGH for 3-4 hours, or LOW on 7-8 hours. Shred beef into the broth mixture after cooking. In a small bowl, whisk together arrowroot and 2 Tbsp water. Pour into the slow cooker and stir to combine. It should almost immediately thicken. Serve when you’re ready!

If you prefer not to make this in a slow cooker:

1. You can make it in a Dutch oven using the same method–cook everything in the Dutch oven, not a sauté pan. Bake it at 300 degrees for about 3 hours, or simmer it on the stove top for 2-3 hours.
2. Serve stew.