How to Make It
Combine first 8 ingredients in a large bowl. Add lamb and sirloin, stirring gently to combine. Shape lamb mixture into 18 meatballs. Thread 3 meatballs onto each of 6 (10-inch) skewers. Cup your hand around each meatball, gently shaping each into an oval around skewers.
Heat a grill pan over medium-high heat. Coat pan with cooking spray. Arrange skewers on pan. Grill 8 to 9 minutes or until done, turning occasionally.