This is one of those deceptively simple recipes, passed down through friends of friends, that everyone adores. Once chilled, the juice is brisk and refreshing. Since rhubarb is quite tart, you may be surprised that there's no added sugar in this recipe. I was skeptical at first, too, but it really works. Once strained and chilled, the juice has a mixture of tartness and sweetness that resembles homemade lemonade.