Reverse engineering flavours is a fun exercise... and leads you in some weird directions at times. There's a particular kind of creme du'methe snowcone I encountered in the south of France as a wee lad... and I've never been able to replicate it or find a source for the syrup. It's not peppermint or spearmint, or any other kind of mint i've found. It had an almost lemony after-taste with a kind of cool-mint up front.