Instructions:

1. Marinate the chicken
   Step 1:

   In a mixing bowl, combine olive oil, lemon juice, minced garlic, ground cumin, paprika, ground coriander, ground cayenne pepper, ground turmeric, ground cinnamon, ground ginger, ground cloves, ground nutmeg, ground cardamom, plain yogurt, and vinegar. Add the boneless and skinless chicken thighs to the marinade, making sure they are well coated. Cover the bowl and refrigerate for at least 2 hours or preferably overnight to let the flavors infuse.
2. Prepare the onions
   Step 2:

   Before grilling the marinated chicken, thinly slice a large onion and separate it into rings. Set aside for later use.
3. Grill the chicken and onions
   Step 3:

   Thread the marinated chicken onto skewers, alternating with the sliced onions. Grill the chicken skewers and onions on a preheated grill or stovetop pan over medium-high heat. Cook for about 4-5 minutes on each side or until the chicken is fully cooked and has a nicely charred appearance.
4. Serve and enjoy
   Step 4:

   Once the chicken shawarma is cooked, remove the skewers from the grill. Serve the chicken shawarma with pita bread, tahini sauce, and your favorite salad. Enjoy the delicious and flavorful Chicken Shawarma Arabic Style!