How do you cook a 2.8lb sirloin tip roast beef?

To cook a 2.8 lb sirloin tip roast, preheat your oven to 325°F (160°C). Season the roast with salt, pepper, and any desired herbs, then place it on a rack in a roasting pan. Roast for about 25-30 minutes per pound, or until the internal temperature reaches 135°F (57°C) for medium-rare. Let it rest for at least 15 minutes before slicing to allow the juices to redistribute.