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The production of kaons is not particularly difficult, if you have the right equipment. Using the Super Proton Synchrotron at CERN, the researchers fire a beam of high-energy protons at a stationary beryllium target. This produces a secondary beam of about a billion particles a second, about 6 percent of which are a kind of kaon that's charged.

https://www.sciencealert.com/cern-confir...ew-physics

Kaons don't have a long lifespan; they form, and decay, in a hundred millionth of a second. 

So, in that secondary beam, kaon decay is happening constantly, generally turning into a super heavy cousin of the electron called a muon, and a neutrino.

In around 13 out of every 100 billion kaon decays, however, the result is an antineutrino, a neutrino
& an unstable particle made of another flavor of quark and an antiquark called a pion.

"Kaons and pions are particles containing quarks. The fact that quarks are of different types (up, down, strange, charm, beauty, top) is called flavor," Lazzerino told ScienceAlert.