Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Coat the chicken in the yogurt, ginger-garlic paste, Kashmiri chili powder, tandoori masala, lemon juice, mustard oil, and salt, pushing the marinade into the slashes; rest at least 4 hours, preferably overnight.
Thread the pieces onto long iron skewers, as tandoor stalls do.
Cook in a hot tandoor or a 240°C oven until nearly done, about 15 minutes.
Baste with melted butter and return to high heat until the edges char and the juices run clear.
Serve straight off the skewer with onion rings, a lemon wedge, and green chutney.