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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.
.. Restaurants and meat purveyors that specialize in medium-rare cuts of Top Sirloin slow roast at temperatures of 170-215* for up to 20 hours. The general rule is about 20-25 minutes per pound @ 225 for rare to medium-rare, but I find you usually have a little more leeway without fear of over-cooking.o roast beef slowly, preheat the oven to 250+ degrees F. After it is preheated, wait an additional 20 minutes before putting the roast in. Then put the roast in the oven and/or lower the temp to 200-225 F. Cook the meat until it gets to 120 degrees F (2.5â5 hours).