SWEET STIFF STARTER (peak 4-6 hrs)
115g active starter
115g bread flour
45g water
25g sugar
Stir to combine; knead briefly so there are no dry pockets of flour. Put in clear, wide-mouth container, loosely cover and let ferment until triple in size (78-80° for 4-6 hours)
TANGZHONG
16g bread flour
40g water
40g whole milk
Mix and cook over medium - medium-high heat until thick; cover with plastic wrap and set aside until cool.
FINAL DOUGH
All of the sweet stiff starter
All of the room-temperature tangzhong (87g)
137g bread flour
62g whole milk
12g milk powder
45g sugar
5g salt
32g unsalted butter, softened
Put all ingredients except for the butter into the bowl of a stand mixer with the hook attachment. Mix on low until the ingredients are slightly incorporated and then take up to speed 2 for 5 minutes. If it's too dry, add milk 1 tsp at a time, being careful as butter will add more moisture. Add the butter in 2-3 batches. Knead on speed 4 for about 10 minutes. Look for windowpane. Transfer to lightly oiled bowl, cover and proof in warm place for about 2 hours (78-82°) until 1.5x.
Lightly grease your loaf pan (I prefer the Pullman loaf pan with or without a lid). Punch down the dough and knead it a few times. Divide into 3 equal parts. Round the dough into balls, cover and let rest for 10 minutes. Working with one ball at a time, flatten with your palm and roll out to a rectangle the length of the pan and double the width. Fold the 2 sides to meet in the middle and then roll the dough lightly like a Swiss roll. Place doughs side by side in the pan. Cover and let the dough proof again until it fills 80-90% of the pan.
Preheat oven to 375°. If using it, place lid on pan and put pan in oven on middle rack. If not using lid, brush top of loaf with milk or an egg wash. Bake for 30 minutes. If using a lid, after initial 30 minutes, turn oven to 350° and continue to bake for 5 minutes. Internal temperature should be 190°. Once out of the oven, drop the pan on the counter to release some steam and immediately remove from pan to a cooling rack. For a soft, shiny crust, brush immediately with melted butter. Let cool completely before slicing.
