This is a very pleasant & simple dish. I called it Forestière because my grandfather used to call anything garnished with mushroom Forestière —meaning of the forest. Though the porcinis mushrooms are not wild & neither were all the mushrooms my grandpa used!
Pan fry the cod (4/5 mns each side) with a dollop of clarified butter. Reheat the small new potatoes cut half length – they are already boiled – in the pan with the fish, add a little fat if needed. The fresh green beans had also been parboiled and will be added to the sautéed small porcini mushrooms. I sautéed the porcini with olive oil until crispy & towards the end added the persillade —chopped parsley & garlic.
Once you have removed the fish & potatoes from the pan melt a dollop of unsalted clarified butter in the same pan, with low heat under the pan to keep the butter from browning, add the juice of one freshly squeezed lemon, salt & pepper to taste; use this mixture to coat you fish once on the plate. Voilà! Satisfying, quick & healthy.