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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.
Insert a meat thermometer into the center of the roast, then place it into the oven and heat for 15 minutes. Victor Holguin/Demand Media. Lower the oven temperature to 325 degrees and heat the sirloin tip roast for an additional 28 to 30 minutes per pound.The brief high temperature will give the roast a flavorful, golden outer coating.ower the oven temperature to 325 degrees and heat the sirloin tip roast for an additional 28 to 30 minutes per pound. The brief high temperature will give the roast a flavorful, golden outer coating.