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1
Lightly crack the dried gardenia pods and place them in a small saucepan with 200 ml of water. Bring to a gentle simmer and hold for 10 minutes. The water will pass from clear through yellow to a deep golden-orange. Remove the pods and reserve the coloured liquid.
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2
Peel the satsumaimo and cut into even rounds. Place in a saucepan, cover with the gardenia-tinted water (add plain water if needed to submerge), and simmer until completely tender. A skewer should meet no resistance at the centre.
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3
Drain the cooked satsumaimo, reserving a little of the golden cooking liquid. While still hot, pass the potato through a fine-mesh strainer (uragoshi) into a clean saucepan, working it through in small batches. The paste below the strainer must be entirely smooth and free of fibre — any residual lumps or threads signal that straining is incomplete and the step must be continued.
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4
Score an X on the flat side of each fresh chestnut. Roast at 200 °C for 15 minutes, then peel immediately while hot, removing both outer shell and inner membrane. Place the peeled chestnuts in a saucepan with 300 ml water and 150 g sugar. Simmer gently until the chestnuts are golden, tender, and have absorbed the syrup to a glossy finish. They must hold their shape without breaking.
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5
Set the strained sweet potato paste over low heat. Add the 150 g of sugar — calibrated to approximately 30% of the paste weight — and stir continuously with a wooden spatula, incorporating a little reserved gardenia cooking liquid if the paste is too stiff to work. This is where the dish lives or dies: the sugar must be fully dissolved and the paste must reach a consistency that holds its shape when mounded but is neither crumbly nor slack — too little sugar compromises both flavour and preservation; too much liquid produces a paste that will not hold form in the osechi box. Taste for sweetness: the richness must be unambiguous.
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6
Remove the sweet potato paste from the heat and allow it to cool to warm — not hot. Gently fold the whole simmered chestnuts into the paste, taking care not to break them. The finished kuri kinton should be smooth, dense, and gold-coloured, with intact chestnut pieces distributed evenly throughout.