I stewed rhubarb in the crock pot last week!
Wash and chop and put in the crock.
On high .... only a couple of hours. (variable to size of crock and amount of rhubarb!)
After stir in jello powder, and sweeten to taste.
Recipe had said to add 1/4 cup water for 4 cups. Next time I'll probably only wash the rhubarb and let that be the moisture.
The extra water created too much liquid, so I scooped some of it off and kept in a jar ..... mix equal parts with ginger ale for a nice drink!