from Wikipedia:
Shawarma is made by placing strips of meat or marinated chicken on a skewer. Animal fat and an onion or tomato are placed at the top of the stack to provide flavoring. The meat is then roasted slowly on all sides as the skewer rotates in front of or over a flame for a period of several hours (see rotisserie). Traditionally a wood fire is used, but recently a gas flame is more common. While many specialty restaurants might offer two or more, usually of different meats some establishments have one skewer.
Different sort of meat can be used for it, The principle is that the meat will be placed on a skewer, and can be grilled even for the whole day. Chunks of meat fat make sure that the meat stays fat and juicy.
After cooking, the meat is shaved off the skewer with a large knife, an electric knife or a small circular saw, dropping to a circular tray below to be retrieved. Shawarma is most commonly eaten as a fast food, made up into a sandwich with pita bread or rolled up in lafa (a sweet, fluffy flatbread) together with vegetables and a dressing. Vegetables commonly found in shawarma include cucumber, onion, tomato, lettuce, parsley, pickled turnips, pickled gherkins, cabbage, and in some countries, such as Jordan, Israel or Saudi Arabia, french fries.
And here is what the platters come with according to Allears.net:
Shawarma Platters - served with side of hummus, tabbouleh and Tangierine CousCous salad with fresh Moroccan bread. Chicken & Lamb $13.95; Lamb $11.95; Chicken $11.95