Fortunate enough to have some Amer Picon, I tried this again. Intrigued by the origin story, I sought out the GumboPage.com site referenced by Difford's under History. Difford's indicates the each ingredient has been reduced by one third, but I believe in fact only the amount of gin has been altered. I wanted to try the original recipe calling for 2oz of gin but as I only had Plymouth Gin Navy Strength, I reduced it as per Difford's adaptation thinking it might approximate the original. Very tasty but 1) as per comment below, maybe some acid would elevate this drink, and 2) I won't be driving tonight!