Some of the best ways to cook tender sirloin tip roast is to sprinkle it with seasoning probably an hour or two before cooking it in the oven. Make sure you allow the meat to arrive at room temperature before placing it in the oven to make it even taster. Preheat the oven to 500F then cook the beef for five minutes per pound. Once you have arrived at the desired degree leave it inside the oven for a minimum of two hours before serving it to your guest. Learn more tips in roasting your sirloin by visiting http://www.livestrong.com/article/405426-the-best-ways-to-cook-a-tender-sirloin-tip-roast/.