Sirloin steak should be cooked using dry-heat methods such as broiling, grilling, or pan-broiling, with tips on trimming fat and using tongs for handling. Cooking temperatures for desired doneness are specified, with internal temperatures for medium rare at 145°F and medium at 160°F. Detailed cooking instructions for broiling, grilling, and pan-broiling are provided, including timing and techniques for determining doneness.