Moroccan Spicy Bean Soup

A wonderful winter warmer, this is one of those invigorating, almost spine-tingling, soups that also manages to be really satisfying. My mother loved to make it, although she did not use as much harissa as I do. I’m sure it was inspired by the brief time she spent in Casablanca on that arduous journey home. Dried beans, soaked overnight and then cooked, can be used instead of tinned, if you like. You need to halve the quantity of beans if using dried rathe