Step 1 – First Marinade: Toss chicken with lemon juice, chili powder, salt. Refrigerate 20–30 min.
Step 2 – Make the Tikka Marinade: Whisk hung curd smooth; stir in ginger garlic paste, mustard oil, spices, salt — thick enough to coat a spoon.
Step 3 – Marinate the Chicken: Coat chicken thickly; refrigerate at least 2 hours, ideally overnight.
Step 4 – Thread the Skewers: Preheat oven to max (500°F) upper rack, or grill high. Thread chicken alternating with onion and pepper; leave space between chunks.
Step 5 – Roast Until Charred: Roast 12–15 min, turning once, until 165°F (74°C) and edges charred.
Step 6 – Finish with Mustard Oil and Serve: Brush hot tikka with mustard oil; serve on sizzling platter with onion rings, lemon, mint chutney.