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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.
Heat some oil in a large cast iron pan over medium-high heat. Sear each side of the roast for 3 to 4 minutes or until it is browned on all sides. 1  Alternatively, use a Dutch oven for the entire process. 2  Sear the roast inside the Dutch oven on the stove.lace the meat on the grill. Transfer the seasoned roast to the unlit portion of the grill. Cover the grill and cook for 1 hour. 1  Stick a meat thermometer into the center of the sirloin tip roast to test its internal temperature.