Ham cut into very thin slices. Arrange 4 covered and covered below 4 slices ham (to obtain a rectangle of 4x2 slightly interspaced pieces of ham). Dab with the cottage cheese, which is salted to taste, sprinkle top with grated carrot and the oil. Wound on a roll. Leave in the refrigerator for at least 2 hours. * The products are for 2 rolls.