Preheat the oven to 180C  15 min.Cut the pitta bread into 3 cm wide strips and brush lightly with 1 tbsp of the oil.  Sprinkle with the parmesan cheese and bake for 10 min, or until crispy.Heat the butter and the remaining oil in a large frypan until sizzling.Add the spring onions and the field mushrooms and cook over mediumheat until mushrooms is tender.Add the button mushrooms, swiss browns, and pine mushrooms and cookuntil the liquid has evaporated.Remove from the heat and stir through the enoki mushrooms.Arrange the toasted strips of bread into an interlocking square.Pile the mushrooms in the center, top with the chervil and serve immediately.