This dish is very easy to prepare and personally, I found that the following ingredients create a distinct taste and flavour of the dish when compared with other type of steamed fish: Coriander roots, lemon glass, lemon and fish sauce. All the others ingredients will enhance the taste but I will deem it to be more of an optional ingredients. If you can’t assemble all ingredients, just get ready the above mentioned 4 ingredients to have a reasonably authentic Thai Steamed Fish .