Rinse the soup mix and soak in cold water for 8 hrs or overnight, covered in a cool place. Drain and rinse well.

Heat the oil in a large pan and fry the onion, leek, turnip, carrots and celery for 10 mins, covered with a lid, until soft but not golden. Add a generous pinch of salt and a good grinding of pepper.

Pour the stock into the pan and bring to a simmer. Add the drained soup mix, and gently simmer for 1 hr part-covered, until the barley and split peas are tender. Season again if needed. Stir in the kale, and cook for 10-15 mins until tender, then ladle into bowls to serve.