In a bowl, mix together cumin, coriander, turmeric, paprika, cloves, and garlic powder. Set aside.
Pat chicken thighs dry and season with salt. Slice into bite-sized pieces.
In a large bowl, place chicken and add the spice mix from above. Add in onions, lemon juice, and olive oil. Toss mix and cover for at least 3 hours.
Preheat oven to 425°F. Remove chicken from fridge and start to fill up a baking sheet. Make sure to lightly oil the sheet. Roast for 30 minutes on the top rack.
Prepare pita pockets, add in tahini sauce and desired condiments.
Once chicken is ready, serve with pita pockets and add in chicken shawarma, arugula and pickles.