Sirloin tip roast is cut from the loin region. It is a very versatile roast. Lean, juicy, and tender if handled correctly, the sirloin tip boasts good flavor. The secret to a great roast is low and slow. Sear at room temperature on all sides on the stovetop, move it to the oven at 275 degrees for about 20 minutes to the pound. Rare - 120 F, Medium Rare - 125F, Medium - 130 F. Tent with foil and allow roast to rest for 15 minutes before slicing thinly across the grain of the meat.