History of Tandoor takes us back by 5000 years to Indus valley and Harappan civilizations of ancient Indian Subcontinent.

The raw chicken is marinated in a mixture of dahi (yogurt) and tandoori masala, a spice blend. It is seasoned and colored with cayenne pepper, red chili powder, or Kashmiri red chili powder as well as turmeric or food coloring. The skin is generally removed before the chicken is marinated and roasted.

The marinated chicken is placed on skewers and cooked at high temperatures in a tandoor oven, which is heated with charcoal or wood, which adds to the smoky flavour. The dish can also be cooked in a standard oven, using a spit or rotisserie, or over hot charcoal.

There is a range of tandoori recipes for whole grilled chicken, some of which are cooked in a tandoor and others over charcoal. These include Chirga (Roasted whole chicken); Tandoori Murgh (Roast whole chicken with almonds); Murgh Kabab Seekhi (Whole stuffed chicken on the spit); Kookarh Tandoori (Steamed chicken on spit); Tandoori Murgh Massaledarh (Whole spiced chicken on spit); and Murghi Bhogar (Chicken in the Bhogar style).

Tandoori chicken can be eaten as a starter or appetizer, or as a main course, often served with naan flatbread. It is also used as the base of numerous cream-based curries, such as butter chicken. Local varieties of tandoori chicken prepared from the rooyi posto in Bengal have appeared in local eateries, particularly those between Kolaghat and Kolkata. Tandoori chicken was popularized in post-independence India by Moti Mahal, Daryaganj in Delhi when it was served to the first Prime Minister of India, Jawaharlal Nehru. There, tandoori chicken became a standard offering at official banquets.

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https://en.wikipedia.org/wiki/Tandoori_chicken