For the pork lung roast au gratin, remove the sinews from the lung roast and divide it into 4 pieces. Season with salt, bell pepper, cumin, paprika powder and crushed garlic.
Pour a little olive oil over it and leave it covered in the refrigerator for 2 hours. Cut cleaned and washed mushrooms into slices.
Mix water with some lemon juice and put the sliced mushrooms in it. Remove the seeds from the peppers and cut them into noodles. Chop the parsley.
Fry the meat in a frying pan in a little oil on all sides and remove from the pan. Roast the peppers and mushrooms and add the parsley. Place the pieces of meat on top of the vegetables.
Sprinkle a lot of cheese on top. Pour gravy and soup on top. Bake in oven until cheese is golden brown. Cut the meat into thicker slices and arrange with the vegetables.
Season the gravy and pour over the meat.