Mix flour in water well without any lumps. Cook over until you see some lines appear in the mixture for every stir you make with the spoon. Its done. (About 65oC) You get the tangzhong. Remove from heat. Let cool in room temperature (*)
In a stand-mixer bowl with dough-hook (or large bowl with hand-held mixer with dough-hooks), mix together all ingredients include tangzhong (*) exept butter and knead until conpletetly incorporated. Add butter and mix until the dough is extremely smooth. The dough is very sticky.
Knead the dough into a ball shape. Place in a greased bowl and cover with a wet towel or cling wrap.
Let it proof till it's doubled in size, about 40 minutes (depends on weather)
Transfer to a clean floured surface. Deflate and divide the dough into 6 equal portions. Knead into ball shapes. Cover with cling wrap, let rest for 15 minutes.
Roll out each portion of the dough with a rolling pin into an oval shape. Fold 1/3 from top edge to the middle and press.Then roll to the bottom. Pinch to seal. Turn seal downward. Roll and stretch to about 20cm in length. With seal downward, place in the loaf tin. Repeat this step with the rest of the dough.
Let proof in the tins, covered with cling wrap.
When the dough rises and almost reaches to the rim of the load tins, lightly brush the surface with whisked egg.
Bake in a pre-heated 180C (356F) oven for 25 to 30 minutes, until turns golden brown.
Remove from the oven and transfer onto a wire rack. Brush melted butter on it. (Optional).
Ta da..
Served with condensed milk.
Or jam.
