Tl;dr
I've told this before but in 2007'ish I watched the movie No Reservations, its probably my favorite restaurant movie.
Her signature dish was scallops with a Lemongrass sauce. Eckhart kept asking what the secret was and she never told him. But towards the end they went in an Asian market and if you're not paying attention you dont catch it, even if you do you're like wtf did she say.
So I played it back with subtitles and got the secret. Was a cool scene.
She never gave the recipe but I made what I thought it would be and served it with tilefish. I dont say I have a signature dish, but if i did that would be it. Its truly amazing.