Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Blend the coriander leaves, mint leaves, green chilies, and ginger-garlic paste into a smooth green masala.
Mix the paste with the yogurt, lemon juice, cumin powder, and salt; coat the fish cubes and rest 30 minutes.
Thread the fish cubes onto skewers, leaving small gaps.
Grill over high heat, basting with oil, until just cooked with lightly charred edges.
Serve hot with lemon wedges and onion rings.