Bain-marie n. : A vessel for holding hot water in which another vessel may be heated without scorching its contents; -- used for warming or preparing food or pharmaceutical preparations.

Example:
how to cook chicken curry to put in a bain marie on a catering van?

Taxonomy
bain-marie, heat, bains, container, marie, liquid, free encyclopedia, outer container, maximum temperatures, bath, alchemist, High heat, heat source, Moses, The Jewish Alchemists, metal container, pots, hot water.

Defination from the web:
bain-marie to prevent the top from cracking in the center. Custard may be cooked in a bain-marie to keep a crust from forming on the outside of the custard before ... Some charcuterie such as terrines and pâtés are cooked in an "oven-type" bain-marie. ...