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1
Dry-roast the kalpasi, marathi mokku, coriander seeds, cumin seeds, dried red chillies, fennel seeds, cardamom, cloves, and cinnamon in a heavy pan over medium heat, moving them continuously, so each spice toasts evenly rather than scorching on the hottest part of the pan. The spices are ready when the kalpasi releases its forest-floor and woody aroma and the whole spice set smells deeply fragrant — this is the full aromatic foundation of the dish.
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2
Transfer the toasted spices immediately to a spice grinder and grind to a fine powder while they are still warm, so the residual heat keeps the volatile oils mobile and the grinding runs clean. Add the freshly ground black pepper to the finished powder and set aside.
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3
Heat the oil in a wide, heavy pan over medium-high heat. Add the pearl shallots whole and cook, stirring, until they are golden and softened at the edges, because leaving them whole means they caramelise at the surface while staying tender inside, giving the base a sweeter, more layered character than chopped shallots would.
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4
Add the ginger and garlic to the coloured shallots and cook, stirring, until the raw smell has entirely left the pan and the mixture is fragrant and golden, because any trace of raw ginger or garlic at this stage will sit underneath every other flavour in the finished dish. You are looking for a cohesive, deeply golden paste, not separated pieces.
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5
Add the complete ground Chettinad spice mixture — including the black pepper at its full, primary quantity — to the shallot base and cook, stirring constantly, so the spices fry in the oil rather than steam in their own moisture. This is where the dish lives or dies: the paste must fry until it no longer smells raw and the oil begins to separate around the edges of the mass, showing the spices are cooked through; insufficient frying leaves the flavour unresolved, while scorching the kalpasi and marathi mokku at this stage destroys an aromatic that cannot be recovered.
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6
Add the chicken pieces and turn them to coat thoroughly in the spice base, then cook over high heat, turning the pieces, until the chicken is sealed on all surfaces and has taken on deep colour from the spice paste, so the crust that forms holds the masala against the meat through the final cooking. Season with salt.
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7
Reduce the heat, cover the pan, and cook the chicken in its own moisture and the spice base until the pieces are cooked through, lifting the lid occasionally to stir and ensure nothing catches on the base. The dish is done when the oil has separated and the masala clings closely to the chicken — there should be no standing liquid.