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1
Place each dry spice — coriander seed, cumin, cardamom, cinnamon, cloves, star anise, white pepper — into a dry pan individually over medium heat, toasting each to its own aromatic endpoint so that no single spice scorches while another is still raw. The pan is ready for the next spice when the one before it is fragrant and just beginning to colour. Remove nutmeg from this sequence and grate it fresh, because the volatile oils that give it life dissipate in a hot pan before the nut itself takes on any useful colour.
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2
Combine all toasted whole spices with the grated nutmeg in a mortar and pound to a fine, uniform powder before any wet aromatic is added, so that a single wet ingredient does not seize the mass and leave coarse fragments of spice unbroken at the centre. The powder is ready when no gritty fragments resist the pestle and the combined smell is a single warm, layered note — neither any one spice dominant nor raw.
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3
Place shallots and garlic unpeeled into a dry heavy pan over medium-high heat, charring and turning occasionally until the exterior is blackened and the interior has softened and sweetened, because the skins act as a shield that forces the heat inward and draws out a smoky depth you cannot achieve by roasting peeled aromatics. Peel away the charred skins and confirm the aromatics are ready when they yield under light pressure and smell smoky-sweet rather than sharp.
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4
Begin the mortar work with the fibrous and hard aromatics — lemongrass, galangal, and kaffir lime rind — pounding to a rough paste before adding the soaked dried chillies, because introducing the chillies to an unprepared mortar lets their moisture cushion the impact and leave fibrous threads intact. Continue pounding until the mass is homogeneous, then add coriander root and pound further; add the charred shallots and garlic and work them in fully until no discrete threads or lumps remain visible and the texture is dense and cohesive.
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5
Add the ground dry spice powder and the kapi, then pound and fold until the spice powder is fully incorporated and the paste reads as a single substance — because under-worked paste at this stage will bloom unevenly in the wok and leave pockets of raw spice in the finished curry. Take a small amount and fry it briefly in a little coconut fat in a hot pan to read its balance: the paste is correct when the aroma is simultaneously Thai — aromatic, fermented, citric — and warmly spiced in the manner of the Indian kitchen; if the smell reads as primarily dried chilli, increase the dry spice proportion, and if the warm spice dominates and the aromatics are lost, pound in additional lemongrass or kapi.