Prepare the Chicken Marinade: Cut the chicken thighs into thin strips. Whisk together olive oil, lemon juice, minced garlic, and shawarma spice blend. Add chicken and marinate for at least 30 minutes.
Whip Up the Tahini Sauce: Combine tahini paste, lemon juice, minced garlic, and salt. Whisk in cold water until smooth.
Chop the Toppings: Dice tomatoes and cucumber, shred lettuce, slice red onion, chop parsley, and slice pickles.
Cook the Shawarma Chicken: Heat olive oil in a skillet. Cook chicken in batches until browned and fully cooked. Let it rest.
Warm the Pita Bread: Warm each pita in a skillet until soft.
Assemble Your Pitas: Spread tahini sauce inside each pita. Add chicken and toppings. Drizzle with tahini sauce and sprinkle with parsley.