From a pisco sour recipe printed on a bottle of pisco bought in the Lima airport: a list of ingredients including "jarabe de goma". An English-Spanish dictionary defines "goma" as "rubber". This puzzled me enough to send me to Waverly Root, which yielded the information that "goma" is Japanese for sesame. Is there such a thing as sesame syrup? If so, is it a common ingredient in pisco sours? Or am I completely off base here?