Add salt and oil to gruel. Add flour to gruel, first by stirring, then with hands, until a dough of kneadable consistency is formed. Mixture should be an "earlobe" texture, firm yet pliable. Leave slightly moist, as more flour is added while dough is kneaded on floured board until smooth (about 300 times). Make into loaf, Place in a oiled bread pan. Brush top with water. Make a 1 cm deep cut down the center of the loaf. Cover with damp towel and set in warm place overnight. Bake at 350 190ºC for 75 to 90 minutes, until sides and bottom are dark brown.