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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 roast on your prepared baking sheet and place it in the oven. Cook for about 1 hour and 20 minutes. 1  Use a meat thermometer to check the temperature of the roast. 2  At this stage, it should be 115 degrees Fahrenheit (46 degrees Celsius).over 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. 2  At this stage, it should be 140 degrees Fahrenheit (60 degrees Celsius).