Cover the bottom of a baking dish with a finger of fatty salt.
We put the sardines on top, with guts and without deflashing and covered with another finger of fat salt.
We introduce in the oven preheated to 180º C between 15 and 20 minutes (the time will depend on how fat our sardines are).
After this time we take out of the oven. We will have formed a crust with the salt that we will break with the help of a spoon taking care not to break the sardines.
We remove the salt and dispose in a dish.