Chop the eggplants, salt them and allow tostand for about 1 hour. Rinse and strain them. Afterwards, sauté them in olive oil and onion and add the snails, the grated tomatoes and let them boil for a while. Pour 2-3 more glasses of water, bring them to a boil and add trahanàs, salt and pepper. Continue boiling, until thoroughly cooked.