Heat 4 tablespoons of the olive oil in a large heavy-bottomed pan until smoking. Add the sliced fresh mushrooms and fry, stirring constantly, for 15-20 minutes, or until the mushrooms have become very dark and soft. Remove and keep warm.
Wipe clean the pan. Strain the porcini, retaining their juices, and rinse and squeeze dry. Heat the remaining olive oil in the pan and gently fry the g