Soak the brains in cold, salted water for 20 minutes, then remove the membranes that cover them.

Place the brains in cold water to which vinegar and a little salt have been added. Boil for six minutes, counting from the time that small bubbles begin to appear. Let cool in the cooking water. Place the brains on a serving platter. Sprinkle with olive oil and lemon juice. Decorate with parsley and olives.