In large saucepan, cook onion, celery and bell pepper in butter until
soft.
Add ham and tomato sauce; simmer 15 to 20 minutes.
In separate saucepan, bring navy beans with bacon to boil.
Puree beans and their liquid in a food processor or blender; add to ham
mixture.
Add the water; season to taste and simmer for 1 hour. Serve piping hot.
Serves 4.