Start by removing the stalks from the mushrooms, and slicing the caps. Melt some butter in a frying pan and chuck the mushrooms in [on a medium heat]. Cook until tender.
Season and cook the pork steaks as instructed [I personally cook at 180C in a conventional oven]
When the pork steaks are nearly cooked, place the mushrooms on top with some chunks of cheese.
Once the cheese has melted to your liking, take the pork stakes off the tray and pour the juices into the frying pan you used for the mushrooms [return the pork steaks to the tray and put back in the oven making sure the oven is turned off]. Add a splash of water to the frying pan, return to the heat and add a little bit of flour to thicken it up.
Once the new potatoes are cooked, I like to add a knob of butter and shake them up. Then I add any excess butter to the sauce in the frying pan. Season sauce to taste with salt and pepper.