Mix all of the marinade spices in a mixing bowl with the lemon juice.
Cut the chicken into small bit size pieces and add it to a large zip-lock bag. Pour marinade over chicken, seal bag and mix marinade into the chicken using your hands. Refrigerate for 1-2 hours.
While the chicken is marinating, prepare the garlic tahini sauce.
In a food processor, combine garlic, tahini and kosher salt. Slowly add the oil and lemon juice (1 teaspoon at a time until desired consistency). Place in a bowl and add the yogurt, mix well and set aside.
Heat a grill pan over high heat. Cook the chicken until done, about 8-10 minutes. Remove from heat.
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For all you Mediterranean food lovers, here's the wonderful video to prepare Chicken Shawarma with garlic tahini sauce. This video prepares pita wrap chicken with simple yet authentic ingredients. Chicken shawarma, served with accompaniments like chopped parsley, tomato, onion, pickles and red pepper sauce can make a very wholesome snack. So the wait is over if you want to enjoy truly Mediterranean chicken shawarma with garlic tahini sauce.