Take all of the ingredients marked with the { } and place them into a small cloth bag. Tie the bag closed. Put water, marrow bones,, the bag of spices, the vegetables, & salt into a large pot. Bring to a boil over high heat, skim the foam off as it occurs. Cook for 10 minutes at a boil, add the beef roast, boil for 3 minutes, reduce heat to low, cover, and simmer for 3 1/2 hours. Be sure to skim occassionaly. Remove from heat, remove the roast from the pot, slice for serving. NOTE: This is excellent with a honey-onion sauce.