By Nigella Lawson
If you can’t get such a variety of fresh mushrooms, use about 850 g of those mixed mushrooms you can pick up in ready-assembled packages in the supermarket.
Put the dried porcini in a measuring jug and pour on hot but not boiling water from the kettle to come up to the 300 ml mark. Put half the butter and the 2 tablespoons olive oil into a pan. Turn on the