Japanese Tangzhong Milk Bread (Water Roux)

Japanese Tangzhong Milk Bread (water roux)

25 g bread flour
125 ml water
350 g bread flour
6 g instant yeast
55 g sugar
5 g salt
7 g powdered milk
1 egg
125 ml milk
30 g butter, softened
Directions:

1 Make tangzhong (water roux) by wisking together the 25 g flour with the 125 ml of water in a small saucepan.
2 Heat mixture over medium-low heat while stirring constantly until it thickens enough that your stirring leaves 'lines' or 'trails' on the surface, and then remove from heat immediately and scrape into a small bowl.
3 Cover bowl with plastic wrap to prevent it from drying on the surface and cool to room temperature.
4 Put milk, egg and cooled tangzhong in mixer bowl or bread machine pan.
5 Add remaining ingredients except butter and turn on machine to begin mixing.
6 Mix until ingredients just come together and then add butter.
7 Knead until dough is smooth and elastic and will form a windowpane when stretched.
8 Proof dough, covered, until it doubles.
9 Deflate dough and divide into 4 equal portions, trying to make them as equal as possible (weighing is the best way).
10 Cover and rest 15 minutes.
11 Roll out each portion into an oval shape.
12 Fold each side of the oval to the middle and roll again to flatten the seam.
13 By hand, roll up each portion of folded dough starting at the unfolded end, so it resembles a swiss roll.
14 Place all four rolls into a greased 9" x 5" bread pan with the ends of the rolls facing the long sides of the pan.
15 Cover and proof until doubled.
16 At this point you can apply an egg-wash by beating an egg and lightly brushing it over the top of the dough (optional).
17 Bake in preheated 350 degree F oven for about 30 minutes, until a deep golden brown.
18 Remove from pan and cool on wire rack.
19 If you didn't use an egg wash, you can brush tops of hot bread with melted butter if desired.
20 NOTE: for those of you who do not have a scale, the measured ingredients would be: tangzhong=2 Tbsp + 2 tsp flour, 1/2 c water, Recipe=2 1/2 c bread flour, 2 tsp instant yeast, 4 T sugar, 1 tsp salt, 4 tsp milk powder, 1 egg, 1/2 c milk, 3 T butter.