This is the foundation of everything. Five minutes of work that transforms the entire loaf.

Whisk the 20g of bread flour and 100g of whole milk together in a small saucepan until no lumps remain. Place it over medium-low heat and cook, stirring constantly with a whisk or spatula, until the mixture thickens to a paste-like consistency. Think thick pudding. This takes 3 to 5 minutes.

You'll know it's ready when you can drag a whisk through it and it leaves clear lines that hold their shape for a moment.

Transfer to a small bowl, press plastic wrap directly onto the surface to prevent a skin from forming, and let it cool to room temperature. You can also make this up to 24 hours ahead and refrigerate it, which is what I recommend for a stress-free bake day.

In the bowl of your stand mixer, combine the 300g bread flour, 35g sugar, 6g salt, and 7g instant yeast. Give it a quick stir with the dough hook to distribute everything evenly.

Add the cooled tangzhong, the egg, and the 100g of warm milk. Mix on low speed for about 2 minutes until a shaggy dough forms and no dry flour remains.

Increase to medium speed and knead for 6 to 8 minutes. The dough will look rough at first, then smooth out. It should pull away from the sides of the bowl but still stick slightly to the bottom.

Now for the butter. This is where patience matters. With the mixer running on low, add the 45g of softened butter one piece at a time. Wait until each piece is mostly incorporated before adding the next. This takes about 3 to 4 minutes. Don't rush it.

Once all the butter is in, increase to medium speed and knead for another 5 to 7 minutes. The dough is ready when it's smooth, slightly tacky (not sticky), and passes the windowpane test. Stretch a small piece thin enough to see light through without it tearing.

Why add butter last? Fat coats gluten strands and prevents them from forming strong networks. By developing the gluten first, then adding butter, you get both structure and tenderness. Skip this order and you'll end up with a dense loaf.

Shape the dough into a ball and place it in a lightly greased bowl. Cover with plastic wrap or a damp towel. Let it rise at room temperature (75-78°F) until doubled in size, about 1 to 1.5 hours.

The dough should look puffy and feel light when you lift the bowl. If your kitchen runs cool, place the bowl in your oven with just the light on. That usually gets you to about 78°F, which is the sweet spot.

Enriched doughs rise slower than lean doughs because of the fat content. Don't panic if it takes longer than you expect. Be patient and let it fully double.

This is where shokupan gets its signature look. Dividing into three pieces creates that beautiful pull-apart structure and makes sure the loaf bakes evenly throughout.

Grease your 9x5-inch loaf pan with butter or neutral oil.

Gently deflate the dough and turn it out onto a lightly floured surface. Divide into 3 equal pieces, about 190g each if you're using a scale (and you should be).

Working with one piece at a time, flatten it into a rough rectangle about 4x6 inches. Fold the short ends toward the center like a letter, then roll up tightly from the short end into a log. Place it seam-side down in the prepared pan.

Repeat with the remaining two pieces, arranging all three side by side so they touch.

Cover the pan loosely with plastic wrap or a clean kitchen towel. Let it rise until the dough reaches about 1 inch above the rim of the pan, approximately 45 minutes to 1 hour.

The dough should look puffy and jiggly when you gently shake the pan. Watch it closely. Overproofed dough will collapse in the oven or give you a gummy texture. This is the most common mistake I see.

About 20 minutes before baking, preheat your oven to 350°F (175°C) with a rack in the lower third.

Gently brush the top of the dough with milk or melted butter. This gives you that golden, slightly glossy crust.

Bake for 30 to 35 minutes until the top is deep golden brown and the internal temperature reaches 190 to 195°F. If the top browns too quickly, tent loosely with foil for the last 10 minutes.

Remove from the oven, let it cool in the pan for about 10 minutes, then turn it out onto a wire rack. Try to wait at least an hour before slicing. I know that's hard. The bread is still cooking internally even after it comes out of the oven, and cutting too early gives you a gummy interior.