Searing adds flavor...lots and lots of flavor. The flavor is added to the outside, in the form of caramelization or browning. Searing requires high temperatures to achieve the desired results. As juices escape, the outside of the meat gets drier, and hotter. That hot, dry part of the meat is needed for the chemical reactions to occur that cause intense browning. The best cut of meat to use with this method of cooking is the rib eye or delmonico steak which have sufficient fat to produce a moist, tender result. Ideally, the steaks should be a minimum of one and a half inches in thickness.