Bovril is the trademarked name of a thick, salty beef extract, sold in a distinctive, bulbous jar. It is made in Burton upon Trent, Staffordshire and distributed by Unilever UK.
It can be made into a drink by diluting with hot water. It can also be used as a flavouring for soups and stews, or spread on bread or toast, rather like Marmite.
Some Bovril lovers (as seen at football matches) like to shake white pepper and a little cayenne into the drink. Burton Albion have named their home end after Bovril due to the sponsorships between club and company.
A recipe for beef tea that precedes Bovril 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