Preheat the oven to 170 degrees.
Roll out the dough and cut out 4 discs with a diameter of 12 cm (depending on the molds you have) and save the scraps (see below). Line the molds, make holes in the bottom with a fork and cook for about 10 minutes.
In a bowl, mix the ricotta with the oil, salt and pepper. Then add the chopped mushrooms, thyme and grated truffle. Mix all the ingredients with a fork. If the mixture is too dry, add a drop of milk.
Once cooked, take the tarts and fill them with the ricotta cream.
Place the savory tarts in the oven for a further 15 minutes or until they are golden brown.
Remove the savory tarts from the oven. Sprinkle with more truffle and serve.