Heat the oil in a large saucepan. Add the onion along with a pinch of salt and gently fry for 8-10 mins or until softened. Stir through the garlic and cook for 1 min. Tip in the pearl barley and 600ml of the stock. Bring to the boil, lower to a simmer and cook for 35 mins, stirring regularly, until nearly all the liquid has been absorbed and the pearl barley is tender. Add the remaining stock, a splash at a time, to loosen if it looks too thick.

Roughly chop half of the podded broad beans (or pulse a few times in a food processor), keeping the rest whole. Stir all the broad beans into the risotto along with the lemon zest, mint, ricotta, basil and parmesan (with a splash more stock or water if it looks dry). Season, then serve in bowls with extra mint and parmesan scattered over.