This recipe is from southernfood.about.com. Very sweet, but also very tasty! A great recipe for making lots of tasty jelly for very little money. I make multiple batches and give away lots of jars! These instructions assume that you are familiar with the basics of jelly making. The yield is approximate. UPDATE: Some reviewers found this too sweet and had trouble getting it to set. I did some research and suspect that the problem may be variances in the acidity of watermelons. I would suggest adding about 2 tablespoons of lemon juice to ensure proper acidity.