"Corning" beef involves brining tough brisket for 2-3 weeks. the "corns" are actually large pieces of salt. Although corning beef was very popular in the UK long ago, there's not evidence to say it wasn't also practiced in Germany, Switzerland, Austria or any other Northern European countries. As for the assertation that it's Irish - that's contentious, because cows were sacred to the Gaelic Gods and beef was expensive.
Didn't stop the Irish who went to America, mind you, where they found an abundance of moos and began corning like mad.
The OXO cube was invented by Justus von Liebig - or at least, he invented the base for it in 1840 - meat extract. He founded a company in England, called LEMCO, which produced the meat extract, until in 1910, LEMCO developed the OXO cube. By that time, poor old Justus was 12 feet under, drowned in a vat of Bovril.
Interesting Fact: Fray Bentos is a small city in Uruguay. Uruguayans are serial meat eaters; per capita consumption is around 45 Kgs a year. Justus von Liebig partnered with a Belgian engineer, George Christian Giebert and they set up a meat extraction business in Uruguay. They made beef extract and corned beef and, eventually, OXO cubes. Since the company was British owned, the products were sold under the brand name Fray Bentos.