Beef Barley Soup w/'Shrooms

Use 10 quart SS pot.
Brown 2 lbs. beef bones + 1 lb. diced beef chuck (1/2" dice).
Add 2 lg. diced onions - lightly saute.
Add 6 quarts cold water.
Add 1 lb. barley - rinsed.
Add 3 bay leaves
Add 1/4 cup chopped parsely stems - reserve leaves for garnish.
Bring to boil - lower heat - partialy cover -
simmer 2 hours - add water as needed.
Add 2 lbs. sliced 'Shrooms (mushrooms) - simmer 1/2 hour more.
Add 1 cup each, diced carrots and celery - simmer until tender (1/2
hr.).
Remove bones, and bay leaves.
Season to taste w/salt & pepper.
Serve with chopped parsely leaves as garnish.