of Carbonize
Source: Webster's dictionaryAs they necessarily lack the carbonizing or seasoning of the classic steel or iron wok, non-stick woks do not impart the distinctive taste or sensation of "wok hei." Source: Internet
Carbon steel woks, however, tend to be more difficult to season than those made of cast-iron ('seasoning', or carbonizing the cooking surface of a wok, is required to prevent foods from sticking and to remove metallic tastes and odors). Source: Internet