This week, world leaders are doing what countless Brits do every summer: unpacking their bags in a charming corner of Cornwall. The G7 summit — Joe Biden’s first, and Angela Merkel’s last — is taking place in the resort town of Carbis Bay, a stone’s throw from St Ives.

Between the speeches and the roundtables, will the world leaders find time to tuck into Cornwall’s proudest and most popular export, the Cornish pasty? Boris Johnson talked about the region’s industrial history in the run-up to the event: ‘Two hundred years ago Cornwall’s tin and copper mines were at the heart...