A pungent, tangy North Indian specialty infused with robust pickling spices, mustard seeds, fenugreek, nigella seeds, and fresh green chillies.
Mix the chicken with yogurt, achari masala, lemon juice, and salt, and rest 30 minutes.
Soak the basmati for 30 minutes, then parboil with whole spices until 70% done.
Heat mustard oil in a heavy pot, splutter the fennel seeds, and fry the onion until golden, then add the marinated chicken and cook until half done.
Layer the chicken, rice, and mint leaves in the pot.
Seal the pot and cook on low heat for 25 minutes.
Rest 10 minutes, fluff gently, and serve hot.