Al Ritt's simple (although a twisted thread abdomen, like a Yong Special, would be a bit easier/faster), but effective pattern; the post really helps with visibility.
hook - Dai Riki 125 #20
thread - Gudebrod 10/0 black
Abdomen - stripped hackle stem black
wing - Congo Hair white
case/post - McflyFoam cerise
hackle - grizzly
Part 1
Mash down barb, start thread
tie in hackle stem, wrap thread back to bend, then forward to hook point
wrap stem forward, tie off and brush with Sally
tie in CH, McflyFoam, hackle
wrap hackle, tie off, trim