This story in the Guardian is about the Singapore Food Agency's approval of the sale of "Chicken bites”, laboratory-cultured meat, from San Francisco startup Eat Just. Cultured meat is "grown" in laboratories from muscle cells taken from live animals, with no need to kill the animal.
The headline asks the question, "What is there to beef about?" The word beef comes from the Old French word bouef, and you probably already know that beef is meat from cattle, but the idiom "to have a beef with someone or something" means to have a dispute or complaint.