What novel is the quote a shot of midori perhaps from?

The quote "a shot of Midori perhaps" is most likely from the novel "The Secret History" by Donna Tartt.

It's a line spoken by the character Richard Papen, reflecting on the hedonistic and decadent lifestyle of the group of Classics students he befriends.

While it's not the most famous line in the book, it perfectly captures the mood and tone of the novel.