Tom kha kai Dill weed is a common herb which is used in Lao cuisine. The Thais' answer to dill weed (known in Thailand as "phak chi Lao" (), since it is known locally as a Lao herb) in Thai "tom kha" is coriander or cilantro ("phak chi", ). There are other versions of "tom kha kai" made with seafood ("tom kha thale", ), mushrooms ("tom kha het", ), pork ("tom kha mu", ) and tofu ("tom kha taohu", ). In the late 19th century, "tom kha" was not a soup. it was a dish of chicken or duck simmered in a light
Herb herb can refer to a much larger range of plants, with culinary, therapeutic or other uses. For example, some of the most commonly described herbs such as Sage, Rosemary and Lavender would be excluded from the botanical definition of a herb as they do not die down each year, and they possess woody stems. In the wider sense, herbs may be herbaceous perennials but also trees, subshrubs, shrubs, annuals, lianas, ferns, mosses, algae, lichens, and fungi. Herbalism can utilize not just stems and leaves but also fruit, roots, bark and gums. Therefore one suggested definition of a herb is a