If using oven instead of crock pot, preheat oven to 350 degree F.
Place 5 to 6 pounds of roast beef in a Dutch oven or crock pot. In a bowl mix together dry soup, black pepper and concentrated beef soup base. Pour soup mixture over roast. Add water to Dutch oven to cover half of the roast. Omit water, if using a crock pot.
Oven bake a minimum of 4 hours, or for a crock pot, set temperature on high for 20 minutes, then cook on low 8 to 10 hours. Meat is finished cooking when it pulls apart easily. Allow meat to cool, then shred.
Skim any excess fat from remaining juices. Place meat into juices and reheat for serving.
Toast your buns. Add desired meat; then add shredded cheese over the top of the meat and heat briefly to melt the cheese, under your broiler.
Add bacon, grilled onion, bbq sauce, etc...