Excerpt from Wiki:
” Tandoori chicken is a dish originating in the Indian subcontinent. It is widely popular in South Asia particularly India and Pakistan, Malaysia, Singapore, Indonesia and the Western world. It consists of roasted chicken prepared with yogurt and spices. The name comes from the type of cylindrical clay oven, a tandoor, in which the dish is traditionally prepared.
The chicken is marinated in yogurt and seasoned with the spice mixture tandoori masala. Cayenne pepper, red chili powder or Kashmiri red chili powder is used to give it a fiery red hue. A higher amount of turmeric produces an orange color. In milder versions, both red and yellow food coloring are sometimes used to achieve bright colors, but turmeric powder is both mild and brightly colored, as is paprika, a sweet red pepper powder. It is traditionally cooked at high temperatures in a tandoor (clay oven).“