
Rhubarb syrup is a sweetener made by dissolving sugar into rhubarb juice or an infusion of the stalks.
Sharp and tangy up front, with a jammy vegetal sweetness and a clean, slightly astringent finish.
Sweetening and adding tart fruit character at once, it is stirred or shaken into the build in small measures, standing in for plain sugar syrup where a sour-fruit edge is wanted.
Another tart red-fruit syrup, such as a cranberry or sour-cherry syrup, gives a comparable sweet-sour profile.
Rhubarb syrup starts from the tart red-green stalks of the plant, which are juiced or simmered and strained, then combined with sugar in roughly equal weight to hold; the finished syrup runs pink to rose depending on the fruit.
Refrigerate in a sealed bottle and use within a couple of weeks, as it ferments and loses brightness over time.