S ixty bowls of slime-green soup sit waiting for the children to arrive. Pupils rush in from their morning lessons, grab the bowls by the handles and start slurping. No complaints, no refusals. (OK, maybe a few “bleurgh” faces.) Chicory soup dispatched, they get stuck into the main course: falafel, Mediterranean vegetable tagine and couscous. Some ask for seconds; most grab a piece of fruit for dessert and run out to play.

This is a typical Thursday lunchtime in BS De Stadspoort primary school in Ghent, Belgium. Similar meat-free menus are being eaten in other schools and nurseries across the city, plus community centres, care homes and assisted living facilities, not to mention many work canteens and restaurants. Thursday in Ghent is officially “Veggie Day” , with residents encouraged to eschew any meat or fish. So how did a city get its children – and everyone else – to eat their greens?

‘Veggie Thursday’ for schoolchildren in Ghent. Photograph: Isabelle Pateer/The Guardian

It didn’t happen overnight.…