Lightly oil a cast iron pan on medium-high heat. Allow the cast iron to warm up before searing the chuck roast.
Prep the chuck roast by scraping off any excessive fat. Pat it dry with a paper towel and sprinkle on some black pepper and sea salt.
Sear the roast for 2-3 minutes on each side, until it gets a golden brown texture.
In a large stock pot, add the seared chuck roast, roughly chopped onion and celery leaves, fresh rosemary, and parsley. Add water to the stock pot, about ¾ full of water. Let simmer for 45-60 minutes or until meat is tender.
Remove the tender chuck roast. Cut into bite-sized pieces.
Strain the beef stock, removing all solids but keeping the liquid. Pour the liquid back into the stock pot.
Pour in beef bone broth, bouillon, chuck roast, chopped carrots and celery. Let simmer covered for 30-45 minutes or until the veggies are tender. Add in diced tomatoes, chopped cauliflower, broccoli and cabbage. Cook until the vegetables are tender, about another 25-30 minutes. Serve with a slice of sourdough bread. Enjoy!