They’re all drinking whiskey sours and playing poker.
Why hasn’t there been fan art of this scene?
P.S. It also makes me wonder: If Trixie isn’t merely teasing, and this whiskey-drinking and poker-playing tradition goes back a few years, if perhaps Shelagh/Sister Bernadette isn’t quite the teetotaler we’ve made her out to be. I would assume some religious orders are permitted to drink in moderation on special occasions, since I’ve seen priests who smoke like chimneys.
However, I think we can continue to assume that Sister B/Shelagh was always terrible at poker. Everything she’s thinking shows in her face.