I have “mugi miso” (barley miso paste) and “genmai miso” (brown rice miso paste) now fermenting in the storage room of my home.

A loaf of artisanal sourdough can easily cost £4 or more – enough to make any shopper wince at the counter. How, then, can supermarkets sell their own ‘sourdough’ for half the price, and are we really ...