About Oxo cubes
Oxo cubes are broken up and added to boiling water to make a stock or hot drink.
Varieties of Oxo cubes
There may be others but at the time of writing, their website was Coming soon...
A recipe for beef tea that precedes Oxo by a five hundred years:
Take a grete glasse and do thi beef therin, and do onyone mynced and whole cloves and maces and pouder of pepur, and lay splinters in the bottom that the flesh hot not and stop it well, that no eyrie goo oute, and seethe hit with an esy fyre- [or] sethe it ina pt with water in a cawdron, but top it well that no erye goo oute.
A. Borde, 1500