In a large soup pot, brown the beef cubes on all sides with the onion. Season with salt and pepper. Add the water Bring to a boil. Skim off any residue that is on the top of the water. Lower the heat to medium and cook for an hour.
Add the beef soup base according to instructions on the brand you use. Add the carrots and celery. Continue to simmer on medium, while the pan is covered for an additional 30 minutes,or until the vegetables are tender.
Taste and add more pepper and salt if needed. In another pan cook the pasta till just done as instructed on the package. Drain and add to the soup pot. Serve with Parmesan cheese on the side.