About 20 years later in Japan,Kikunae IKeda was eating a bowl of soup.As he ate, he tried to decide what made the soup so delicious. his wife told him how she made it. ther basic ingredient was dashi,a stock made with kelp, or dride seaweed, Suddenly,it occurred to him,too:there weren't four tastes, There was a fifth,and this was it the deep,full taste in ther stock