This recipe is from the magazine Fine Cooking. It's by far the best beef stroganoff I've ever tasted. It wasn't difficult at all, and didn't take much time. I made it after work one evening. The ingredients were readily available in my grocery store, and well worth the investment. The porcini mushrooms really add a great flavor and deeper color to the beef broth. I'd be proud to serve this dish to company. Note: I recommend you prep all remaining ingredients while the dried porcini is steeping. The rest of the steps are very quick, and don't allow time for prepping as you go. Second note: I buy whole beef tenderloins at Costco for a very reasonable price. I remove the silver skin myself with a sharp meat carving knife. I get a fabulous roast, quite a few filet mignon steaks, and the funny shaped thinner "tail" part (about a pound) is perfect for this recipe, although you could use any part of the tenderloin.