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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.
1. An hour before cooking, remove the top sirloin roast from the refrigerator to bring to room temperature. 2. Preheat the oven to 250 degrees and set the rack to the lower middle position.. Adjust oven temperature to 500 degrees and cook until the internal temperature reaches 130-140 degrees, about 15-20 minutes. 6. Remove the top sirloin roast from oven and tent with foil. Let it rest at least 15- 20 minutes to allow the juices to redistribute themselves evenly throughout the roast.