In small bowl stir together spice rub ingredients. Sprinkle sirloin with about 2-tbsp/30 mL spice rub. Reserve remaining rub in airtight container for future use. Thread beef onto skewers along with vegetables. Grill or broil turning occasionally, until meat is cooked to desired doneness, about 5 to 7 minutes. Serve atop a bed of cooked couscous or rice.