Ironically enough, while I lived in UK for almost a year now, there was a Middle Eastern (Egyptian, I think) gentleman who ran a food stall near where I lived and sold nothing but Shawarmas.
He would have chicken rotating on a spit over a heated element, and would shave off the outside regularly onto pita bread or the like. He would add a cucumber-yogurt type sauce that reminded me of the sauce they'd put on gyros, and then for those who liked it spicy, a unique red and somewhat spicy sauce as well as some dry seasoning to shake over it. I think it would have been fabulous with lamb, but the chicken was amazing as it was, with some onions, tomatoes, and lettuce added. It was perfection! I will always remember this dish.
I'd like to find someone who has a good, tried and true recipe for the ingredients to a shawarma like this! The dry seasoning, the yogurt sauce, and the hot sauce all- and any technique to preparing it all. I'd love to do this for my family- and I'd like to do it using an authentic recipe like they did on that street corner.
I'll take any good ones though- and I'm sure all here who haven't yet had it, and try it, will be thankful as well. This is one dish I will always remember, more than any other food I had in UK.