I don\'t find sirloin to be that bad of a cut if it has some fat. Actually grilled a sirloin tip steak this weekend. Just did a basic black pepper mix then some worcestershire and a little liquid smoke. Let it sit overnight(had something come up so postponed steak one night).
I think the key is cutting around all the connective tissue or whatever you call fat/stuff in between muscle groups.
After grilling and letting rest, I cut around all the fat/tissue and then into smaller pieces. We put on a salad and was pretty good!
Other idea is to do a fresh ground sirloin burger/hamburger steak! Might need a little fat to help hold together. Saute mushrooms and shallots in butter with a splash of brandy.
Tenderizing for a chicken fry is definitely an option too.