For the medical condition, please see boil.
Boiling was a method of preparing food by cooking it in a liquid. The temperature at which a liquid boiled was known as its boiling point. Idioms associated with the method included "a watched pot never boils" (TNG: "Timescape"), "boiling mad"/"emotions". (TOS: "Turnabout Intruder", VOY: "Repression") and something "boils down to". (PIC: "Et in Arcadia Ego, Part 1")
Chadre'kab could be prepared by boiling it. (VOY: "The Raven")
Kellerun prepared their cake by boiling it. (DIS: "Mirrors")