Malva nut (scaphium scaphigerum) is also named Pang Da Hai, literally “fat sea”, because its cracked rind will expand and almost fill the entire cup once it is placed in boiling water. So, plenty of water is required when this nut is cooked or soaked. to its awesome healing and preventive properties, many people consider it as an ideal tea for sore throat since they are accustomed to boiling and drinking it once they feel there’s something wrong with their throats.