In a large pot cover ham bone with 2 quarts water.Bring to a boil- add the peas, onion, celery and carrots.
Add seasonings, reduce heat to medium low and cook for about 1 1/3 hours.
Remove the ham bone. Let cool and remove the meat left on the bone.
Chop the meat slightly and return to the soup.
Cook for another 30 minutes or until soup is thick.
Serve with crackers or croutons.