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1
DAY 1 — Make the tangzhong. Whisk the flour and milk together in a small saucepan until no lumps remain. Set over low heat and stir constantly with a silicone spatula, scraping the base of the pan, until the mixture reaches exactly 65°C on an instant-read thermometer. At this temperature the paste thickens visibly, leaving clear lines when the spatula is drawn through it. Remove immediately from heat. Transfer to a bowl, press clingfilm directly onto the surface, and cool to room temperature.
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2
Combine the flour, yeast, sugar, and salt in the bowl of a stand mixer fitted with the dough hook. Add the beaten egg, lukewarm milk, and the cooled tangzhong. Mix on low speed until the dough comes together into a shaggy mass, approximately 2 minutes.
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3
Increase to medium speed and knead for 8–12 minutes. Add the softened butter piece by piece during the first 3 minutes; do not add it all at once. Continue kneading until the dough is smooth, supple, and passes the windowpane test: a small piece stretched between the fingers holds a translucent membrane without tearing.
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4
Shape the dough into a ball. Place in a lightly oiled bowl, cover with clingfilm, and refrigerate overnight (8–12 hours). The cold retard develops flavour impossible in a same-day bake; the dough will rise slowly in the refrigerator.
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5
DAY 2 — Divide the cold dough into three equal portions. Working one at a time, flatten each piece into a rough oval, fold the long sides to the centre, then roll tightly into a short log. Arrange the three logs side by side, seam-side down, in a lightly buttered Pullman pan. Slide the lid on.
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6
Leave to proof at room temperature for 3–4 hours. The dough is ready when it has risen to within 1 cm of the top of the pan and the surface, pressed gently with a floured fingertip, springs back slowly but completely. Under-proofed dough will collapse in the oven; over-proofed dough will lose its structure — the finger-press test is the only reliable guide.
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7
Preheat the oven to 180°C. Ensure the Pullman lid fits flush. Bake with the lid on for 30 minutes. Remove the lid and bake a further 5 minutes until the exposed top is pale golden. The internal temperature of a fully baked shokupan is approximately 93–95°C; the loaf will sound hollow when tapped on its base.
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8
Turn the loaf out onto a wire rack immediately. Do not slice for a minimum of 12 hours. During this period the crumb structure stabilises from gummy to the cloud-soft texture characteristic of premium shokupan. Slice at 2–3 cm thickness using an electric knife or a sharp bread knife with minimal downward pressure.