My extended family absolutely adores this! I have meddled with the receipe to add bacon (4 oz diced), beer (1/2 bottle hearty ale) and mushrooms (8 oz sliced). The mushrooms and beer create a little more liquid so I add a bit more cornstarch. If you can find it, chocolate balsamic adds a wonderfully subtle touch. You really can't go wrong with such basic addictive foods as bacon, beer and chocolate. You don't taste any of them individually; they just add to the depth of the flavor. Yes, the bacon adds some fat and calories but you add only a little. The resulting taste is so rich that you might actually eat less and the dish lasts for several meals.
I sometimes make it ahead by lifting out the onions and mushrooms from the sauce and refrigerating the meat, veggies and liquid separately. The meat will keep for up to two days. When preparing for dinner, I skim the cold fat off the top, make the gravy and add the onions and mushrooms. The meat slices much better when cold. Arrange the sliced meat in an ovenproof dish, pour the gravy over it, cover with foil and heat in the oven for about 30 minutes at 350.