Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Toss the prawns with turmeric, salt, and ginger-garlic paste; rest 30 minutes.
Mix in the yogurt, chili powder, mustard oil, and half the tamarind paste.
Thread the prawns onto skewers.
Grill over high heat for 2-3 minutes per side.
Brush with the remaining tamarind and jaggery; grill 1 minute until sticky.
Serve immediately with lime wedges.