I would basically describe this as a citrus cola flavor, but I think it is anything but basic. There are quite a few different flavors in here, most noticeably the citrus top notes, a light cinnamon in the middle, and vanilla low notes. You can see the complete list of flavors and ingredients on the OSV website.
It is absolutely essential to let this one age at least a week. The citrus notes are rounded out and a more dynamic flavor will develop. Without aging I though it tasted like a lemon bar pastry. Decent, but nowhere near as good as a 10 day old bottle of this magic sauce.