Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Whisk the yogurt with ginger-garlic paste, Kashmiri chili, turmeric, garam masala, mustard oil, lemon juice, and salt; coat the chicken and rest 4 hours.
Thread the cubes onto skewers, leaving small gaps between pieces.
Cook over high charcoal heat or under a hot grill, 10-12 minutes, turning occasionally.
Brush with melted butter halfway through and let the edges char slightly.
Rest 5 minutes, then serve with sliced onion and lemon wedges.