Cognac, elderflower liqueur and Chartreuse (a trinity indeed) with dashes of bitters and an aromatic citrus twist. This is a boozy cocktail so you may...
Much too sweet for me. I added a barspoon of fernet and found that helped tame it. I still wanted to soften it and added 1/4 oz campari and a dash of grapefruit bitters. On the whole a better cocktail for me but I think lowering the St Germain to 1/2 oz would also help.