This turned out AWESOME! I have to say I was a little hesitant--I've never done anything with plums before, nor have I ever made any types of butters, but this was easy and so tasty! I did adjust the recipe a little bit, especially after reading comments of people who had already tried it and had some trouble. Here's the link for the original recipe though. Feel free to adjust it to the amount of plums you have...6 lbs. plums (about 12 cups)
2-1/4 c. sugar
2 tsp. cinnamon
2 tsp. vanilla
*Wash plums. Cut them in half and remove pits. (You do not need to peel them). Place in crock pot; stir in sugar. Cook overnight or about 12 hours on low heat. In the morning, prop lid open a little bit and cook on high about 4 hours, stirring frequently. (If you are going to be gone or need more time, leave on low for about another 8 hours). As soon as your plum mixture thickens to desired consistency, add vanilla and cinnamon. Place jars in a water bath for 10 minutes, cool on rack until lids seal. Enjoy!
