Teriyaki is a popular cooking style in Japan. The teriyaki marinade for fish or meat is made with soy sauce, rice wine and sugar and can be bought ready made from most supermarkets. It is intense, so you only need to use a little.
Swordfish is an excellent source of vitamin B12, which apart from its role in the formation of red blood cells is involved in maintaining a healthy nervous system, as it helps to form the protective sheath around nerves.