Nigel Slater’s broth, greens and barley

A hearty, meaty, grain and greens dish for a cold dayRemove any juicy pieces of meat from the bones of the Sunday roast (pork, lamb, chicken, whatever) and reserve. Put the bones into a large pot, pour in enough water to come two-thirds of the way up the pan then bring to the boil. Add 1 onion, halved, 8 black peppercorns, 1 tsp of coriander seeds, a carrot or two, a stick of celery, a couple of bay leaves and 3 star anise flowers. Turn the heat down so the liquid bubbles calmly and partially co