Found in the cookbook From the Lands of Figs and Olives. I don't know if this is supposed to be prepared with 100% white grape juice or 100% concord grape juice. I tested with unsweetened organic concord grape juice. You also have the option of making your own grape juice: Recipe #41039. If your juice is sweetened, omit the sugar in the recipe. An ideal introduction to orange blossom water if you've never tasted it before.