I'm not rating this with stars because I'm sure the problems I had with it is my own fault. It just did not work for me; don't know what I did wrong but I am new to canning so it could be anything. I made this twice - and thought I'd followed the directions exactly but when it finished (sealed fine) it was more like a syrup than a jam and extremely sweet. We could not eat it. I'm thinking I might need to add more fruit but I did weigh it - just not sure what I did wrong.
Very good. I had large plums so I ended up with 6 cups instead of 4 1/2 cups. I just increased the sugar a little bit and used 2 pouches of pectin. It set up great and is beautfiul and tasty.