Our grand mother was doing magic with left overs of meat, in particular porc filet. It would be used in the filling for stuffed vegetables, in cannelloni, or hachis parmentier for exemple. But she would also use them for “mironton”. Her mironton was just simple: onion, potatoes and chuncks of pork meat fried in oil and butter. It was definitely something I loved very much!!! Now her version may have been a little too rich for us now, so I kept the idea but slightly changed the recipe, but the main attributes remain. I replaced the onion by some Japanese mushrooms, and used only a little of olive oil. I cut in rough pieces the left over of the filet mignon and the potatoes (with the skin), and then simply cook them in a heated and olive oil greased pan until golden. The key is to cook until it’s almost burned, and then stir and repeat. It should for kind of blocks, golden and crispy, but soft inside. Add a bit of salt and pepper when serving.