Rich and Silky Turkey Gravy

I got a free subscription to Bon Appetit magazine for trading in airline miles. I would never pay for that magazine, because I feel like it is very gourmet and not realistic for a home cook like me. I hardly ever cut any recipes out of it, but I did make their recipe for Rich and Silky Turkey Gravy. It came out really great. I used white wine as I didn't have any madeira, and I didn't use the porcini powder because I didn't have any. But this method made a really fantastic gravy, I would like to try this with roast beef gravy as well.