That looks good and I have more than enough rhubarb to try it. I like adding the white grape juice concentrate too.My recipe for rhubarb wine is:
10 lbs rhubarb diced in 1 inch pieces and frozen
10 lbs of white sugar
1 gallon white grape juice
3 lbs of frozen rasberrys
Champagne yeast
Boiled 2.5 gallons of water. Turned off burner and dissolved sugar. Cooled syrup added to 6.5 gallon brew pail with thawed fruit. Let sit for 3 days. Strained out fruit and pressed as much juice as possible. Added grape juice and enough water to make 6 gallons. Added yeast food and yeast.
Ferment was very active and lasted about 5 days. After 2 weeks racked to a Carboy. Let it sit for about 2 months at about 65 degrees. Racked it again and then cold crashed it for about a month. Hit with campden tablets and back sweetened with 2 cups of sugar. Came very clear with a light red color.
OG 1.090
E.G. 0.994
Like everything else I make some people absolutely loved it others didn't
Thanks for sharing!!