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1
Preheat oven to 425u00b0. Rub thyme and seasoned salt onto all sides of roast. Place tenderloin on a rack in a shallow roasting pan. Roast 50-60 minutes or until meat reaches desired doneness (for medium-rare, a thermometer should read 135u00b0; medium, 140u00b0; medium-well, 145u00b0).
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2
Meanwhile, in a Dutch oven, cook bacon over medium heat until crisp, stirring occasionally. Remove with a slotted spoon; drain on paper towels. Discard drippings, reserving 2 tablespoons in pan. Add mushrooms to drippings; cook and stir 4-5 minutes or until tender. Remove from pan.
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3
Place 1 tablespoon butter in pan. Add onions; cook and stir over medium heat 6-8 minutes or until tender. Stir in garlic; cook 1 minute longer. Add tomato paste, stock and wine, stirring to loosen browned bits from pan. Bring to a boil; cook 20-25 minutes or until liquid is reduced almost by half.
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4
In a microwave, melt remaining butter. Mix flour with butter until smooth; gradually whisk into sauce. Return to a boil, stirring constantly; cook and stir 1-2 minutes or until thickened. Stir in bacon, mushrooms, salt and pepper; heat through.
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5
Remove roast from oven; tent with foil. Let stand 15 minutes before slicing. Serve with sauce.
