Question: do you tenderise sirloin steak?
Answer: The best way to tenderize a sirloin steak is to not overcook it in the first place. Sirloin is reasonably tender when it's raw. ... Unless you have a sous vide setup, the only way you're going to get a nice, tender interior is by cooking the steak quickly, so that the inside doesn't have a chance to heat up too much.