1.Place porcini in a small bowl and cover with 1 cup hot water. Stand at least 20mins or until needed.
2.Meanwhile, place pancetta and oil in a saucepan and cook over moderate heat until fat starts to run, about 3 minutes.
3.Add bay leaf and onion and cook for 5 minutes or until onion is soft. Add garlic and cook a further 1 minute, then pour 4 cups water over and bring to the boil.
4.Stir in barley, soaked porcini and soaking water, and tomatoes. Simmer gently for 30 minutes.
5.Add button mushrooms, adding more water if soup is too thick, and simmer a further 10 minutes or until barley is tender. Season and stir in dill just before serving.
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