Take each slice of veal loin and pound between layers of plastic wrap until each is about 1/2-inch thick.
Season lightly with salt and pepper on both sides, then dredge in flour. Heat olive oil and butter in a large saute pan over medium high heat. Shake off excess flour and saute cutlets for about 2 minutes per side, until lightly browned.
Put aside on a cooling rack on top of a baking sheet. Add porter, Marsala, and chicken stock to saute pan. Let reduce on high heat for about 5 minutes. After liquid has reduced by 1/4, add the mushrooms. Reduce heat and let simmer until mushrooms soften and sauce slightly thickens, about 7 minutes.
Add veal back to sauce to warm.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.