|seeds of the Seville oranges are the pectin source: they are in a cheesecloth bag|
Anyways, Seville Orange Marmalade recipe is as follows: http://www.davidlebovitz.com/2007/02/seville-orange/ complete with the story of how Seville orange marmalade became popular. I had no idea orange seeds contained so much pectin. Next time, I will remove the seeds sooner and take the marmalade off the heat sooner and hopefully have the soft set marmalade I'm aiming for. My marmalade is very tasty nonetheless. Three cheers for the warm orange color of marmalade on a grey winter day!