Actually, depending on who you talk to, it's a "combination of flies" or it's actually ONE fly.
I've gotten some replies from some other sources (finally). It looks like some sort of "flesh and egg" or "San Juan Worm & egg combo" are the most common for a fly pattern.
So far, no one has sent me a picture of the (one) fly they're referring to as a "Steak & Eggs".
Bob