Grilled Chicken Shawarma with Charred Red Onion, Naan, and Tahini, Charred Red Onion, Naan, and Tahini

boneless skinless chicken breasts, naan bread enriched wheat flour wheat flour, niacin, reduced iron, ascorbic acid as dough conditioner, thiamine mononitrate, riboflavin, enzyme, folic acid, buttermilk skim milk, dry buttermilk, bacterial culture, water, soybean and or canola oil, cultured wheat flour, eggs, sugar, baking powder sodium acid pyrophosphate, sodium bicarbonate, cornstarch, monocalcium phosphate, sea salt, ghee, wheat gluten, dextrose, dextrin, vegetable fiber, yeast, persian cucumber, red onion, grape tomatoes, lemon, tahini paste, garlic, kabsa spice blend spices, ground chiles, turmeric saffron powder, parsley, cayenne pepper