Let your tri-top rest 10-15 minutes after grilling to allow the juices to reabsorb for juicy, tender meat.
Find the grain (lines of muscle fibers that run throughout the beef) – These fibers can be tough, so you want to cut against, not with, these lines for a more tender and easier-to-chew steak.
Identify the middle of the tri-tip. It has two different muscles, separated by a layer of fat. Cut against this fat layer to separate the two muscles straight in the middle of the beef crosswise to the grain.
Slice into ¼-½ inch thick slices. A good example is to cut it to the thickness of a pencil. Adjust your angle if the grain changes direction in the thinner sections. You want to do this close to serving to prevent the meat from getting cold and drying out. Repeat with the other section.
Serve on a large plate or platter immediately for optimal flavor and texture.