Marinated in spiced yoghurt, Kashmiri chillies, and garlic, then roasted over roaring tandoor charcoal embers with charred edges.
Coat the mushrooms in yogurt mixed with ginger-garlic paste, Kashmiri chili powder, tandoori masala, toasted gram flour, lemon juice, mustard oil, and salt; rest 1 hour.
Thread the mushrooms onto skewers.
Grill over high heat, turning, until the edges char.
Brush with the leftover marinade and grill 2 minutes more.
Serve sprinkled with chaat masala and lemon wedges.