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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.
As this type of roast is only a cut away from the sirloin, it is a tender cut of beef well suited to dry roasting or to braising in a bag. By choosing a roaster bag, commonly referred to as an oven or roasting bag, a sirloin tip roast can be one of the easiest meals to prepare for your family.lace the pan in the lower part of your oven, for approximately 1 Â½ to 2 hours. Exact cooking times vary by the size of the roast and desired doneness. A sirloin tip roast retains its moisture and flavor best when cooked to medium-rare, or 145 degrees F. Step 7.