Most of my cooking is based on spontaneity, but this dish, which has become a signature of mine, is based on one of the few my mom had in her repertoire. I always loved it as a kid, and, as so many chefs before have done with recipes from their childhood, I tweaked it to suit my taste. I use short ribs instead of ground beef, and a peppery sour cream and wild mushroom sauce in place of the canned cream of mushroom soup Mom relied on.