Koppe-pan (コッペパン, oblong school-lunch roll)

Ingredients

Equipment Needed

• •Digital scale
• •Stand mixer with dough hook, or patient hands
• •Bench scraper
• •Parchment-lined baking sheet
• •Cooling rack

Instructions

1. 1

   Make yudane

   Put 30g bread flour in a small bowl and pour the boiling water over it all at once. Stir until no dry flour remains and the paste looks thick and glossy. Cover and let it cool to room temperature. The hot water pre-gelatinizes the starch, which lets the finished crumb hold moisture instead of drying out by the next day.

   Yudane can be made the night before and refrigerated. Bring it back toward room temperature before mixing so it doesn't slow the dough.
2. 2

   Mix the dough

   In a mixing bowl, combine the remaining bread flour, sugar, salt, and instant yeast. Tear the cooled yudane into small pieces and add it with the milk and beaten egg. Mix until a rough dough forms, then rest it for 10 minutes. That short rest lets the flour hydrate, so kneading becomes easier and the crumb turns finer.

3. 3

   Knead and butter

   Knead the dough until it begins to smooth out, 6 to 8 minutes by mixer or 10 to 12 minutes by hand. Add the softened butter in small pieces and keep kneading until the dough is smooth, elastic, and stretches thin before tearing. Add the butter after the dough has structure, because fat coats flour and can slow gluten development if it goes in too early.

4. 4

   First rise

   Lightly oil a bowl, set the dough inside, cover it, and let it rise in a warm place until doubled, about 60 to 75 minutes. It should look rounded and full, and a floured finger pressed into it should leave a soft dent that slowly relaxes. Time is a guide; the dough tells the truth.

5. 5

   Divide and rest

   Turn the dough onto a lightly floured surface and divide it into 8 equal pieces, about 70g each. Shape each piece into a loose ball, cover, and rest for 15 minutes. This pause relaxes the gluten, so the rolls can be shaped oblong without springing back like they have other plans.

6. 6

   Shape the rolls

   Flatten one piece into a small oval, fold the top third down, then the bottom third up, pressing gently to seal after each fold. Roll it seam-side down under your palms into a 12cm oblong with slightly tapered ends. The seam gives the roll a firm spine, so it rises upward and splits neatly later instead of spreading flat.

7. 7

   Proof gently

   Set the rolls seam-side down on a parchment-lined baking sheet, leaving space between them. Cover and proof until puffy and light, 40 to 50 minutes. Touch one gently with a floured finger; the mark should slowly spring back but not vanish at once. Underproofed rolls tear at the side, overproofed ones collapse and bake dull.

8. 8

   Bake softly

   Heat the oven to 180 C. Brush the rolls lightly with milk, then bake for 15 to 18 minutes, until matte gold on top and about 88 to 90 C in the center. Milk gives color without making a hard shine, which is right for koppe-pan. Cool on a rack before slicing, because the crumb finishes setting as it cools.

9. 9

   Split and fill

   For filled koppe-pan, cut a slit along the top or side without cutting all the way through. Open it gently with your fingers and fill modestly. Yakisoba, an-butter, jam-and-cream, or peanut cream all belong here, but don't bury the bread. The roll is part of the meal, not just the envelope.

Chef Tips

• •Buy the best bread flour you can find, around 12 percent protein. Weak flour makes a tender roll that cannot hold its shape, and too-strong flour makes the bite tough. Koppe-pan lives in the middle.
• •A panya roll is usually softer than a home oven wants to make. Keep the bake gentle and pull the rolls when they are pale gold, not deeply browned. A thick crust is wrong for this bread.
• •For an-butter, use tsubuan or koshian and a thin slice of cold butter. For yakisoba-pan, let the noodles cool slightly before filling so the crumb stays soft rather than wet.

Advance Preparation

• •The yudane can be made up to 24 hours ahead and kept covered in the refrigerator.
• •Baked rolls keep two days in an airtight bag at room temperature. Rewarm briefly in a low oven, then cool before filling.
• •Freeze cooled rolls for up to one month. Thaw wrapped, then refresh at 150 C for 5 to 7 minutes.

Frequently Asked Questions

Nutrition Information

1 serving (about 70g)