Shawarma is my life.
I grew up in Saudi Arabia, which basically means I had these 2 Riyal awesomenesses at least 2000 times a week. Well, or I tried to, at least.
So I made this one with toum rather than tahini sauce, but only because I love toum on anything. (Toum is that amazing Lebanese garlic sauce that they serve with shish taouk. Basically just crushed garlic with vegetable oil and lemon.) But you get both on the market, and typically shawarmas have tahini sauce in them.
Sauté shredded chicken in very little oil with salt, cumin and coriander powders. Set aside. Slice up some lettuce, tomatoes and pickles. Heat a khubz (Arabic flatbread) on a pan only for a minute (else it gets brittle) and put the chicken, toum or tahini sauce, lettuce, tomatoes and pickles and roll it up. I like to put the rolled up thing in an oven for a few min and then eat it. Done!