Shouldnt be a problem to cut it in half. There is more then enough acid in it and you arent making a jelly here.
Thanks for answering the question!


That is the answer that I would have given, and what I am going to try. The amount of sugar does seem excessive.
I use the recipe on the next page of the book. I started making this for my Mom, she likes rhubarb and Dad refuses to eat anything rhubarb so she usually goes without. This recipe is also for a "Concentrate" but in reality, Mom drinks this straight out of the Mason Jar. lol. I like it 50/50 with a lemon/lime soda, like a 7-up or a sprite.
Sunshine Rhubarb Juice Concentrate
(from Ball Complete Book of Home Preserving)
12 c. sliced rhubarb
4 c. water
Grated Zest and Juice of 1 lemon
Grated Zest and juice of 1 orange
1 1/2 c. sugar
Combine rhubarb, water and both zests in stainless steel pan. Bring to boil over medium-high heat, stirring constantly. Reduce heat and boil gently util the rhubarb is soft, about 10 minutes.
Remove from heat and stir in the fresh juices.
Transfer to a dampened jelly bag or a strainer lined with several layers of cheesecloth over a deep bowl. Let drip undisturbed for at least 2 hours.
In a clean stainless steel saucepan, combine rhubarb juice and sugar. Heat to 190 degrees. Do not boil. Remove from heat and skim off foam.
Waterbath can for 10 minutes with 1/4" headspace.