Basi is the local beverage of Ilocos in northern Luzon in San Ildefonso where it has been consumed since before the Spanish conquest. In the Philippines, commercial basi is produced by first crushing sugarcane and extracting the juice. The juice is boiled in vats and then stored in earthen jars. Once the juice has cooled, flavorings made of ground glutinous rice and duhat (java plum) bark or other fruits or barks is added. The jars are then sealed with banana leaves and allowed to ferment for several years. The resulting drink is pale red in color. If fermented longer, it turns into suka or vinegar.