Make a horizontal cut on the side of each chestnut.
Place the chestnuts on a baking tray and sprinkle with the water and salt to taste.
Roast the chestnuts for about 30-35 minutes in the oven until they are browned but not overcooked and soft on the inside. You must find a healthy medium to make sure they are not too soft and not too cooked as it makes all the difference.