Bring to a boil. Skim off any foam. Bring to boil again. Cover, reduce heat and let simmer for 15 minutes. Quickly, without moving the lid and letting any steam escape, put in cooker for at least 3 hrs.
All day is fine.
When removed from the cooker, bring to a simmer again for 5 minutes. Adjust seasoning by adding salt to taste and pepper. Strain through a collander. Save meat for hash, tamale pie, etc. Put broth in refrigerator and let fat congeal on top for easy removal, if desired.