Sirloin steak is a cut of beef that's easy to overcook; after that point, it's tough and unappetizing. The trick to a good sirloin steak is to cook it no more than medium, or slightly pink in the center. Use your finger or a sharp fork to see if it's cooked enough.
Season your sirloin steak before you cook it to enhance its flavor and tenderness. Use a steak rub, a marinade or salt and pepper on both sides of your steak.
Pan fry your sirloin steak by heating a skillet on high heat. Drop your sirloin steak in the center of the pan and let it cook for 3 to 5 minutes on each side, turning it only once. The length of time depends upon how thick the steak is cut and how well you want the steak done.
Broil your sirloin steak using the broil setting on your stove. Place it on the rack to directly below the broiler. Broil your steak several minutes on one side before you turn it over, turning only once.
Grill your steak over hot coals for about 3 minutes on each side. For grill marks, rotate the steak a quarter-turn after a 1 1/2 minutes on one side, then flip it over and repeat on the other side.
Use a sharp fork to poke gently into the center of the sirloin steak. For a medium steak, the juices should run slightly pink and the meat should be tender and easy to penetrate.
Push on the center of the steak with your finger. When the steak is done, the meat should be easy to push in and should spring back quickly once you remove your finger.