Add ½ cup of milk (warm the milk in the microwave for 10-20 seconds or leave it at room temperature for an hour before using it.), ½ cup of heavy whipping cream, 1 egg, 1 tablespoon of yeast and ¼ cup of sugar into a mixer. Mix them a little bit. Cover the lid and wait for 5 minutes.
At the same time, in a bowl add 1 & ½ cup of bread flour, ½ cup of cake flour, ½ tablespoon of vital wheat gluten, ½ tablespoon of dough enhancer, 1 teaspoon of salt and mix well.
After that, slowly add the flour mixture into the yeast mixture until the dough is formed. At this moment, the dough is a little sticky. Then, slowly add ¼ cup of bread flour. Let the mixer run for 5-10 minutes at setting 3 (medium high speed) if you use a Bosch bread mixer.
Next, put the dough into a bowl and cover with a wet cloth.
Let the dough rise double size. (Normally, take around an hour or more. I suggest preheating the oven at 200F and turning off. Then, let the dough rise in the oven, it will shorten the time for rising the dough in around 30 minutes.)
While waiting for the dough to rise, work on the filling. First, put 1.5 cups of shredded unsweetened coconut into a chopper to chop them until they are smaller pieces. Then, add 1 & ¼ cup of sugar, ¾ cup of dry milk powder into the chopper and chop them until fine. After that, beat 1.5 sticks of butter (I like to use 1 stick of salted butter and ½ stick of unsalted butter.) in a bowl. After, add chopped fine sugar, dry milk powder, shredded coconut, ¼ cup of cake flour and mix them well.
Divide the bread dough into 9 bigger or 12 smaller, the same as filling.
The filling is a little crumble, so use your hands to press it to make it like an oval or long shape.
Roll the dough into oval shape.
Next, place the filling in the middle of the dough. Then, fold and close it. Roll it like a long oval shape.
Place them on a tray and cover with a wet cloth and let it rise. (I suggest preheating the oven at 200F and turning it off. Then, let the dough rise in the oven, it will shorten the time for rising the dough in around 15-30 minutes.)
Meanwhile, work on the topping. In a small container, melt 1 tablespoon of butter in the microwave for 5-10 seconds. Just a little melt, but not too much. Then, add 1 tablespoon of sugar and 1 tablespoon of cake flour. Mix them well.
Put the topping dough into a small ziplock bag. Then, cut a small hole at the corner of the bag and push pressure to pipe the topping dough.
Beat an egg and brush egg on bread.
Pipe two lines on the bread and sprinkle some sesame seeds and are ready for baking.
Preheat the oven at 350F. Bake at 350F for 18-22 minutes until it's golden brown.