Cut the sirloin into 1 1/2-inch chunks and place in a large bowl.
Combine all the remaining ingredients and mix. Pour over the sirloin pieces and let marinate for 1-3 hours.
Remove the beef from the refrigerator 30 minutes before cooking.
Preheat the grill to medium high while you prepare the skewers.
Divide the marinated sirloin pieces between 8 skewers. When all the beef kebabs are complete, season with salt. Place them on the grill and cook them for approximately 6-8 minutes, turning them every 2 minutes. Cook to your desired temperature. Color is not an accurate indicator of final cook temperature. Ensure final cook temperature reaches 145 F for 3 minutes.
Remove from the grill and serve.