1. Cut steak and red and green peppers into 1-inch (2. 5 cm) pieces.
2. In a bowl, combine lime rind and juice, oil, garlic, jalapeno, homemade chili powder, cumin, rosemary, salt substitute, and pepper.
3. Add beef and toss to coat; let stand for 10 minutes.
4. Alternate pieces of beef, red and green peppers, and onion onto 8 skewers.
5. BBQ on an oiled grill over medium-high heat to desired doneness, turning once.