I do not have a recipe for you, but i think it would be fair to assume, that you could find one in Thomas Kellers Under Pressure: Cooking Sous Vide, because well... Look at the cover :-)
http://www.amazon.com/Under-Pressure-Cooking-Sous-Vide/dp/1579653510
Can I get more information on rhubarb pickle? This is very intriguing.
My only memories of rhubarb is boiled down string mixed with strawberries and jello. Unfortunately, we ate that with almost every meal as my parents loved it. I even dug the roots up and threw them away, and they still managed to come back. Its been a good 20+ years since I have even thought about rhubarb, but I can see where it could make some cool pairings.