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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.
Instructions. Set the sirloin tip roast out at room temperature for two hours so that it cooks evenly. Place the roast on a roasting rack inside a roasting pan to keep it from sitting in its own juices. Heat the oven to 350 degrees Fahrenheit.Coat the sirloin tip roast lightly with vegetable oil so that the seasonings will stick. Rub the seasonings into the meat with your fingers. Bake the roast in the preheated oven for 2 Â½ to 3 Â½ hours or until the meat reaches 130 to 135 degrees Fahrenheit for a medium-rare meat.Cook the roast to a temperature of 120 to 125 degrees for rare meat, 145 to 150 degrees for medium and 155 to 165 degrees for well-done.nstructions. Set the sirloin tip roast out at room temperature for two hours so that it cooks evenly. Place the roast on a roasting rack inside a roasting pan to keep it from sitting in its own juices. Heat the oven to 350 degrees Fahrenheit.