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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.
Step 4. Roast the pork in the oven for approximately 50 to 70 minutes, turning the pork over in the pan after about 35 minutes of the cooking time has elapsed. Remove the roast from the oven when the instant-read meat thermometer registers between 145 and 150 degrees in the thickest portion of the meat.ips. 1  Alter the flavor of your pork sirloin roast by rubbing the meat with different herbs and spices before browning. 2  You can also baste the roast during its time in the oven with stock or wine every 15 minutes for additional flavor. 3  Cooking pork longer isn't better -- you'll only end up with tough, grayish meat.