The book is entitled "Kiss the Sunset Pig" by Canadian author Laurie Gough. It is a travel book about Laurie's trip by car from Ontario, Canada to California. I'm sorry I don't have the book anymore to give you exact references to Joni Mitchell in the book but the title is of course relevant - and questioned by the author in the book as to the exact origin and meaning of the phrase.

(Contributed by S.K. Smith)