Place slices on the plate and slightly salt them and pepper them from the mills. Turn mackerel slices on other side and salt them again. This is a very difficult question, how much salt and pepper it is necessary to use. The most correct answer – salt them and pepper them to taste, but on average, it is enough to make one or two move on the salt mill for each side of each slice of the fish. If you've got not enough space on the plate for the fish, cover fish layer with grease paper or cling film and continue.