The Traditional form of sushi is fermented fish and rice, Preserved with salt in a process that has been traced to Southest Asia, where it remain popular today. The term sushi comes form anarchaic grammatical form no longer used i other contexts, literally, 'Sushi' means 'it's Sour', a reflection of its historic fermented roots. The science behind the fermantation of fish down into amino acids. This result in one of the five basic tastes, Called umami on Japanese. The oldest form of sushi in japan narezyshi, still very closely resembers this process. In japan narezushi evolved into oshizushi and ultimately Edomae nigirizushi, Which is what the world today knows as sushi. Thai cuisine is the national cuisine of Thailand. Thai cuisine places emphasis on lightly prepared dishes with strong aromatic components. more... See more text