Let it simmer awhile, but take it up before it comes to a boil.
Then put in the strained blood and simmer it for another hour, at least.
Cover it close, set it on hot coals, and let it simmer about an hour.
Set the pan on hot coals, and simmer them gently about five minutes.
Simmer them for an hour, and having skimmed it well, strain off the liquid.
Then simmer it gently ...