Mostly known in it's cube form, a bouillon cube (US) or stock cube (UK) is dehydrated broth (bouillon in French) or stock formed into a small cube.

It is made by dehydrating vegetables, meat stock, a small portion of solid fat such as hydrogenated oil, salt (usually well over 50%) and seasonings (usually including monosodium glutamate) and shaping them into a small cube.

Dehydrated broth is also available in granular form. Fresh broth is usually much less salty than bouillon made, due to the salt in cubes and dehydrated bouillion.