House dressing was a type of condiment on Earth, usually poured over salads.
While Jett Reno and Paul Stamets were arguing about the use of warp drive versus spore drive, Reno asked Stamets, "Oh yeah? Do they come with house dressing?" (DIS: "An Obol for Charon")
In 2259, when Captain Christopher Pike asked Doctor Joseph M'Benga for some words of wisdom, he told him to never try the house dressing. (SNW: "Strange New Worlds")