Filets Mignons with Whisky Mushroom Sauce

There’s fantasy and there’s reality. Grilled filet mignon with mushroom sauce turns up at steak houses throughout Uruguay. More often than not, the sauce contains canned mushrooms and starchy thickeners that leave it with a consistency more akin to library paste than sauce. The canned mushrooms are even more perplexing, for if you drive from Montevideo to José Ignacio in the spring, you’ll see wild mushroom vendors lined up every few hundred yards by the side of the road. So here’s the mush