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1
Prepare the matcha syrup. Bring the water and sugar to a gentle simmer in a small saucepan, stirring until the sugar is fully dissolved. Remove from heat. Whisk the sifted matcha powder with a small quantity of the hot syrup to form a smooth paste, then whisk the paste back into the remaining syrup until fully incorporated and without lumps. Cool to room temperature before use. The syrup should taste noticeably sweeter than is comfortable at room temperature — this is correct, as the ice will dilute it. Chill until needed. The syrup is ready when it coats the back of a spoon and the colour is an even, deep jade.
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2
Prepare the ice. If using the directional-freezing home method, fill a lidless container with clean water and freeze slowly overnight so that freezing proceeds from one side, driving air and impurities outward and producing clearer, harder ice. Commercial block ice requires no preparation beyond tempering: allow the block to stand at room temperature for two to three minutes so that the outermost surface softens fractionally — this prevents the blade from skipping. The ice is ready when its surface shows a faint, uniform gloss rather than a dry, frosted appearance.
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3
Shave the ice. Mount the block ice in a kakigōri machine — hand-cranked or electric — fitted with a razor-sharp blade. Apply light, even pressure only; excess pressure compacts the shavings into wet, heavy ice. Shave directly into a deep, rounded bowl. The blade must shear the ice rather than tear it: a dull blade produces irregular, coarse texture and must be replaced or re-honed before service. This is the step on which the dish lives or dies — the shaving angle, blade condition, and applied pressure together determine whether the result is feather-light, translucent snow or an inert, grainy mass that no syrup or topping can redeem. The shavings are correct when they fall as discrete, gossamer wisps and the mound rises freely without collapsing under its own weight.
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4
Build the mound with layered syrup. Shave a base layer of ice into the bowl to a height of roughly one-third of the intended final mound. Pour one-third of the matcha syrup evenly over this layer. Continue shaving to two-thirds height and apply a second third of the syrup. Complete the mound to its full height — taller than it is wide, in the standard mountain form — and apply the final third of the syrup over the crown, allowing it to permeate downward. Layering at three stages, as practised in Kyoto Ujikintoki kakigōri, ensures even green colour and flavour distribution throughout the structure rather than pooling at the base. The mound is correctly built when the colour is an even jade from base to crown with no pale, unsyruped white zones visible at the sides.
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5
Apply toppings and finish. Place anko and shiratama mochi at the crown and, if following the Nara-style buried-treasure approach, press one or two shiratama mid-mound before the final shaving layer so that they are partially concealed within the ice. Drizzle condensed milk over the completed mound as the finishing layer — this is the standard premium kakigōri finish, adding richness and a creamy counterpoint to the ice texture. The finished kakigōri is ready when it stands as a coherent architectural mound with toppings seated at the crown and the condensed milk tracing visible white rivulets down the sides.
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6
Serve immediately. Kakigōri collapses within minutes; the fine snow texture consolidates into coarse, wet lumps even under refrigeration. Place the bowl before the diner at once. No holding, no pre-making. The dessert is at its correct state when the first spoonful yields without resistance and the ice dissolves on the palate into cool flavour without granular texture.