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Preheat oven to 400F. Pat beef tenderloin dry with
paper towels.
Sprinkle with salt and pepper. Heat vegetable oil
in heavy large
ovenproof skillet over medium heat. Add beef to
skillet and cook
until brown on all sides, about 8 minutes. Add
chopped onions,
carrots and thyme to skillet.
Transfer skillet to oven and roast beef until meat
thermometer
inserted into thickest part registers 120F for
rare, stirring
vegetables occasionally, about 30 minutes. Transfer
beef to platter.
Tent with foil to keep warm.
Place skillet with vegetables over medium-high
heat. Add beef broth
and whisky and bring to boil, scraping up any browned
bits. Boil
until liquid is reduced to 2/3 cup, stirring occasionally,
about
7 minutes. Strain sauce and return to skillet.
Mix flour and butter in small bowl until smooth
paste forms. Add
to sauce in skillet and whisk until well blended.
Add whipping cream,
crushed black peppercorns and any accumulated juices
from beef.
Simmer over medium heat until sauce thickens, whisking
constantly,
about 3 minutes. Season sauce to taste with salt.
Cut beef into
thick slices and arrange on platter. Spoon sauce
over.