Great links, Bill. It was fun reading the old posts.
Big Kahuna, Springfield Cashew Chicken is chunks of white breast meat, breaded and fried, topped with an oyster sauce based "gravy", then topped with cashew halves and diced green onions.
It was originally created at Leong's Tea House, then it spread. Gee's East Wind (I believe it was a brother who opened that) served an excellent version, and a place named Cheong's (also related, but I don't remember how) opened several places around town.
Back in the heyday, you could hardly walk down any street in Springfield without passing by a place serving cashew chicken (and every place also served sweet & sour chicken).
All the original places have long since closed, and although there are many places that still serve it, there are very few places that make a quality version.