It got me to looking at my own repertoire and wondering if any of the foods I make qualify as a "signature dish". And to be honest, my mind came up blank. So I called a friend who dines here often and asked her if she thinks of anything I make as a signature dish. Her answer was no because she's never had the same food here twice. No help there.
So I called my husband at work and pulled him out of a meeting, and demanded to know what dishes I make that he would designate as "signature". I've had to pull him out of many meetings in the past few weeks, usually with a plumber or an electrician standing at my elbow, with questions about hose bibs and outlets on the TV wall, so I thought he might enjoy a fun question like this for a change. About ten seconds of dead silence followed before he chose the "no of course your butt doesn't look too big in that skirt" route and gallantly weasled, "Honey, everything you do is a signature dish!" and hung up. Another dead end.
I'm not sure he even remembers the food we ate before we started living on frozen tamales. Yes, that must be it.

So what about everybody else? If you have a signature dish, tell us about it.