John
Asain cooking cooking is, for the most part, vegatables cooked at a VERY high heat causing a vegatable oil. As described by "cgibbson" in his thread, it is carried up with the steam that is also produced, into the exhaust duct. Once cooled it solidify's becoming a very sticky-like liquid, somthing like a consistency between honey and molasses. Once set for some time it becomes extreamely adhesive. Futher lenght of time it becomes dry and hard, similar to tar.
I hope this answers your question.
Stan Sauve
Fire Inspector
City of Calgary, Canada