1) Peel onion and cut into slices, warm 4 tablespoons of oil in a saucepan, unite onion, leave it stew gently for 3-4 minutes, add chopped peeled tomatoes, salty and cook the sauce covered for 15 minutes.

2) Clean the mushrooms, eliminating the earthy part of the stems e rubbing them gently with a damp towel to remove all residues of earth. Cut the largest sliced ​​and the smallest in half and cook them in a pan with 3 tablespoons of oil and a pinch of salt for 5 minutes. Join them with tomato sauce e transferred all in a baking dish.

3) Rinse and dry the nose pads, salt them, pepper them And arrange them in the pan. Cook them in a preheated oven at 180 ° for 20 minutes. Sprinkle them with oregano leaves e serve them.