Place sirloin in crockpot base. Sprinkle on seasoning. Top with onions and peppers. Juice lime on top. Cook for high 4-5 hours or low 6-8 hours.
If desired remove steak and slice into strips. I did this to make sure it was cooked in time.
If desired remove strips and cut into smaller pieces.
Place back into the crockpot to finish cooking and get a bit more tender.
Serve as desired.