Liqueur of a Hundred Herbs

There are not, of course, one hundred herbs in this very strong Abruzzese liqueur, but then nobody really knows what the commercially sold drink contains. The recipe is a very closely guarded secret, held by a kindly old man who runs the business in a tiny mountain village - I reckon when he goes, the secret might well go with him! His Centerbe is produced in an old family house which was built on the proceeds gained from selling Centerbe to sufferers of cholera whenever the south was hit b