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1
Combine the wasanbon with joshinko in a bowl. Work the mixture with the fingers, pressing and folding repeatedly until the texture is uniformly fine and the blend holds a faint impression when squeezed in the palm. The mass should feel like dry, cool sand — no stickiness, no free powder.
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2
Add water one or two drops at a time, continuing to press and fold after each addition. The mixture is ready when it holds a coherent shape under firm hand pressure yet crumbles cleanly at the edge when broken — this is the line the confection cannot cross: too little water and the mould will not release cleanly; too much and moisture content rises above 10%, destroying shelf life and dissolution character. This is where the dish lives or dies.
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3
Fill each cavity of the kigata (carved wooden mould) with the mixture, heaping slightly above the surface. Apply firm, even downward pressure — palm flat, force distributed across the whole mould — until the surface is level and the seasonal motif is fully engaged. Tap the mould sharply against the work surface to release. The released piece should show crisp, unbroken mould detail on all faces.
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4
Arrange the pressed higashi on a clean board lined with washi paper. Allow to stand, uncovered, at room temperature in a dry environment for a minimum of several hours until the exterior has set to a firm, matte surface that yields no impression to a light fingertip. Transfer immediately to an airtight container with desiccant.
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5
To serve in tea ceremony context, place each higashi on washi paper within the higashi-ki stand. The confection should be consumed before the bowl of koicha is presented. On the tongue, wasanbon rakugan dissolves almost instantaneously — the test is this vanishing quality, a pure cane sweetness with faint grain earthiness that clears the palate for thick matcha.