The key seems to be using painted hooks, either chartreuse or orange.

Snow was waiting with two tall, thin glasses of opaque, chartreuse-tinted absinthe.

Fenayrou had three bocks, Lucien one, and Madame another glass of chartreuse.

It also helps that chartreuse and chocolate go extremely well together.

A bottle of chartreuse was brought, and they started in drinking and smoking.