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1 Put the sirloin in the oven and roast it for about 15 minutes for a medium-rare roast, 20 minutes for a medium roast, 25 minutes for a medium-well-done roast or 30 minutes for a well-done roast. 2  Turn the beef over about halfway through cooking [source: Rhodes ].oasts are relatively easy dishes that need minimal seasoning for a tasty dinner. Here's a delicious recipe for sirloin roast. Ingredients: 1  2.2 to 3.3 pounds (1 to 1.5 kilograms) sirloin of beef. 2  2 tablespoon vegetable oil or beef fat.
Quick Answer. Oven-roast beef tenderloin by trimming a whole beef tenderloin, seasoning it with salt, sugar and crushed peppercorn, and roasting it at 475 degrees Fahrenheit for 20 to 25 minutes. Serve the tenderloin with browned garlic butter. Ree Drummond offers a recipe for peppercorn roasted beef tenderloin on FoodNetwork.com.