Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Whisk the yogurt with carom seeds, ginger-garlic paste, turmeric, chili powder, lemon juice and salt; coat the fish gently.
Let the fish marinate for only 30 minutes so it stays firm.
Thread the fish cubes onto skewers, spacing them apart.
Grill over high heat for 8-10 minutes, turning carefully and basting with mustard oil.
Serve hot as soon as the fish is charred at the edges and just cooked through.