"Intensely aromatic dried porcini mushrooms season both the beef and the make-ahead sauce in this elegant dish. The genius "reverse-sear" method makes it perfect for the holidays because you can roast the tenderloins slowly to a perfect medium-rare in a low oven, freeing you up to focus on the rest of the meal, then sear the outside for a browned, flavorful crust just before serving...."
INGREDIENTS
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1 oz. dried porcini mushrooms
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Kosher salt and freshly ground black pepper
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9 medium shallots, peeled and halved lengthwise
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2 medium cloves garlic
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1/3 cup balsamic vinegar
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2 Tbs. olive oil; more if needed for searing
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2 Tbs. tamari
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1 4-inch sprig fresh rosemary
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2 cups lower-salt beef broth
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2 2-1/2-lb. center cut beef tenderloins
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2 Tbs. unsalted butter, cut into 1/2-inch cubes and chilled