Heat the milk, pour it over the dried porcini and leave to soak for 15–20 minutes. Drain, reserving the milk, and chop the porcini.
Heat the oil in a large frying pan, add the garlic and half the parsley, and cook over low heat for 1 minute, stirring constantly. Add the fresh mushrooms and the porcini and sauté for 15 minutes, adding a few tablespoons of the reserved porcini milk. Seaso