In a large mixing bowl, mix together all the ingredients except the onion, making sure to incorporate all of them thoroughly.
Cover the bowl and set in the fridge to marinate (about 1 hour ideally, and not more than 2). Remember to take the meat out of the fridge about 30 minutes before you're ready to grill.
If you're using a charcoal grill, start your coals about 20 to 25 minutes before you want to grill. You want a gentle, medium low heat over which to cook these kebabs.
If gas, just pre-heat your grill to medium low 5 to 7 minutes before cooking.
Skewer your kabobs so they look like this.
6 single layers of onion with 5 roughly 1"layers of chicken skewered between them. As you've probably discovered by now, it's a little challenging to get 1" cubes of meat from chicken thighs, but you generally want a 1" thickness of meat between veg, so you might have to add odd pieces of chicken to the bigger ones to achieve this thickness.
I used only onions mostly because I think it tastes simple and delicious this way.
Over a medium low grill, cook the kebabs about 15 minutes, covered, turning them every 5 minutes.
Enjoy!
