It is easy to cook Khao Yam. The most important ingredient is budu which is made from salty fish or shrimp paste. To cook budu, pour water into the pot, add the budu or shrimp paste with sugar cake, and simmer it for 30 minutes. You can season it with the lemon grass, onion and kaffir lime leaves. After simmering the budu 30 minutes remove it from the heat.