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1
In a small bowl, combine the olive oil, thyme, fennel, caraway, 1 Tbs. salt, and 1-1/2 tsp. pepper. Pat the tenderloins dry with paper towels and coat them with the spice mixture, using your hands to spread it evenly; it will sparsely cover the meat.
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2
Make the sauce
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3
Melt 1 Tbs. of the butter and the oil in a 10-inch skillet over medium heat. Add the mushrooms, shallot, sugar, and 1/4 tsp. salt. Cook, stirring often, until soft and beginning to brown, about 6 minutes. Add the thyme, peppercorns, and half of the wine. Simmer briskly until the wine reduces and just covers the solids, 10 to 15 minutes. Add the remaining wine and reduce again until the wine just covers the solids, 10 to 12 minutes more. Add the beef broth and simmer until reduced by half, about 15 minutes. Strain through a fine sieve set over a 1-quart measuring cup, pressing lightly on the solids. If you have more than 1-1/2 cups liquid, return the sauce to the pan and simmer until reduced to 1-1/2 cups
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4
Melt the remaining 1 Tbs. butter in a 1-quart saucepan over low heat. Whisk in the flour and cook, whisking often, until smooth and light beige in color, about 1 minute. Slowly add the wine reduction, whisking constantly. Bring to a simmer and cook, whisking often, until slightly thickened, about 3 minutes. Season to taste with salt and pepper.
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5
Roast the beef
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6
Remove the beef from the refrigerator and let sit at room temperature for about an hour before roasting. Meanwhile, position a rack in the center of the oven and heat the oven to 375u00b0F.
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7
Arrange the roasts on a flat rack on a large rimmed baking sheet. Roast until an instant-read thermometer inserted in the center reads 120u00b0F for rare , 125u00b0F to 130u00b0F for medium rare, or 135u00b0F for medium, 40 to 50 minutes.
