Setup the grill for 225F. I used an ambient thermometer however you use your hand 3 inches above the grill. Low temperature you will feel the heat 8 to 10 seconds, medium heat 3-5 seconds, high heat 1-2 seconds. Anything less than a second and you are above 600F
Slice and peel in half a red onion. Place one half of the onion in the skewer of the trompo (spiked meat holder) with the flat side on the top.
Medium slice another red onion. Place layers of chicken thigh and a slice of onion. When finished with the chicken, place the remaining half of the onion flat side down at the top.
Pour marinade over the top of the skewer of chicken thighs and onions.
Cook until the chicken reaches approximately 130F. Should take about 45 minutes to an hour.
Adjust temperature to 425F to 450F. If you are using a smoker, remove plate setter and go direct heat. Cook until the thermometer reads 167F
Pull off the grill and let rest 10 minutes.
Carve lengthwise and serve.