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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.
Place the sirloin tip roast into the hot oil and brown each side of the roast for two to three minutes. Diane Shear/Demand Media. Remove the roast from the frying pan and place it into the slow cooker. Cover the slow cooker and allow the sirloin tip roast to cook on high for one hour.Diane Shear/Demand Media. Reduce the slow cooker temperature to low and continue to cook the roast for two hours. Open the slow cooker and flip the roast over.over the slow cooker and allow the sirloin tip roast to cook on high for one hour. Diane Shear/Demand Media. Reduce the slow cooker temperature to low and continue to cook the roast for two hours. Open the slow cooker and flip the roast over.