Japanese Shokupan Milk Bread and the Art of the Pullman Loaf

Ingredients

• For the tangzhong (yudane paste)
• 30 g strong bread flour (12%+ protein)
• 150 ml whole milk, scalded to boiling
• For the dough
• 420 g strong bread flour (12%+ protein)
• 7 g instant dried yeast
• 35 g caster sugar
• 8 g fine sea salt
• 180 ml whole milk, at room temperature
• 40 g unsalted butter, softened, cut into small pieces
• To finish
• 15 ml whole milk, for brushing the crust before baking

Method

1. 1
   Prepare the tangzhong. Combine 30 g bread flour with 150 ml boiling whole milk in a small saucepan. Stir constantly over low heat until the mixture thickens to a smooth paste and reaches 65°C — the pre-gelatinised starch will no longer slip from the spoon and will hold a clean line when a spatula is drawn through it. Remove from heat, press clingfilm directly onto the surface, and refrigerate overnight. This cold rest deepens the hydration of the starch structure.
2. 2
   Combine the remaining 420 g bread flour, yeast, sugar, and salt in the bowl of a stand mixer. Add the room-temperature milk and the cold tangzhong paste. Mix on low speed until a shaggy dough forms, then increase to medium and knead for 8 minutes. Add the softened butter piece by piece, incorporating each addition fully before adding the next. Continue kneading until the dough reaches the window-pane stage — a small piece stretched between the fingers should form a thin, translucent membrane without tearing. Stop at this point; further kneading will over-tighten the gluten.
3. 3
   Transfer the dough to a lightly oiled bowl, cover, and prove either at room temperature until doubled in size, or — as premium bakeries practice — retard in the refrigerator for 24 hours to develop flavour complexity without over-fermentation. The dough is ready when a floured finger pressed into it leaves an indent that springs back slowly and only partially.
4. 4
   Divide the proved dough into three equal portions. Working one piece at a time, flatten each portion into a rectangle and roll it tightly lengthways like a Swiss roll. Place the three rolls seam-down, side by side, into a greased lidded 900 g Pullman tin. This is where the dish lives or dies: the three rolls must fill the tin to precisely 70–80% of its capacity before the final proof — too little and the lid cannot be filled squarely; too much and the crumb will be dense, robbed of the room needed for its final oven rise.
5. 5
   Cover the tin loosely and allow the final proof at room temperature until the dough reaches the 70–80% fill mark described in the previous step and feels pillowy and aerated when pressed very gently with a fingertip. Brush the exposed surface with whole milk for the thin, caramelised glaze characteristic of Japanese shokupan. Slide the Pullman lid on to produce kaku-shoku (square loaf).
6. 6
   Place the lidded tin in an oven preheated to 210°C. After 15 minutes, reduce the heat to 180°C to complete the interior cooking without over-colouring the delicate crust. The loaf is done when the tin sounds hollow if tapped firmly on its base and the kitchen carries a clean, milky caramel aroma — no raw-dough heaviness.
7. 7
   Remove the loaf from the tin immediately and transfer to a wire rack. Allow to cool for a minimum of 30 minutes without cutting. The steam trapped within must redistribute through the crumb; a knife taken to it before this interval will compress and tear the cloud-like interior irreparably. The loaf is ready when the base and sides feel set and firm rather than soft and yielding to the touch.