By Valentina Harris
This recipe from Apulia dates back to the Daunian civilisation 2,500 years ago. It’s one of the simplest soups, but bursting with flavour and with a lovely texture – and the rocket is said to purify the blood.
Cover the potatoes with about 1.5 litres 2½ pints) cold water. Bring to the boil and cook for 10 minutes. Meanwhile, wash and trim the rocket.
Add the rocket to the potatoes (coarsely chopped if yo