This often overlooked cut of meat is not only relatively inexpensive but also very flavorful and has become a favorite among those in the know. The tri-tip roast or steak (also called a triangle roast) is the 1 1/2 to 2 1/2 pounds of meat that sits at the bottom of the sirloin. Not only does it have a rich flavor, but also tends to be lower in fat than most other cuts.