I cut all the rhubarb down and made rhubarb jam. I also googled rhubarb jam and found a recipe for rhubarb butter which is a similar consistency to apple butter. I ended up with 12 pints of jam and butter.
After the evening milking, I had the Farmer do a taste test as to which recipe he liked the best. He chose the regular jam, probably because it was sweeter. He did say though, the rhubarb butter was more flavorful.
Both recipes will keep him happy, he loves his sweets.