I based this recipe on the followin site: (http://www.PickYourOwn.org/watermelonjelly.htm) It worked fine for me. I know that when working with pectin, especially the liquid kind, the results can be iffy. I made double batches of this jelly and both times there was no problem with it jelling. I experimented with watermelon preserves and had a lot of the red fruit left over that I couldn't eat before it went bad. This is how I used up the whole watermelon, jelly and rind preserves. This jelly is so good to me!