Learn how to make soft fluffy milk buns made with tangzhong and filled with two different custards, the traditional creamy custard cream, and a firmer custard cream. Both are delicious and a perfect breakfast treat or as snack.
PREPARE CUSTARD FILLING (can be done the day before):
Decide which consistency of custard filling you want to make. The firm one is suitable for wrapping inside the dough. The soft one is for piping on top of the dough. If you want the soft custard inside the buns, you can pipe it in after the buns have been baked and have cooled down
Whisk egg yolks, sugar, and salt in a bowl. Gradually add in milk and vanilla extract as you are whisking. Sift in the flour and/or starch (depending on which custard you are preparing, firm or soft type) into the mixture and whisk again until no lumps
Put the saucepan over low heat. Add butter and continue to stir until butter started to melt and continue to cook. For firm custard, cook until the custard thickened to a thick paste consistency. For the soft custard, cook until when you lift the whisk, it hangs down as a V shape but will drop down. Remove from the heat. Cover with a cling wrap touching the custard to prevent a layer of skin from forming. Chill in the fridge until it's firm for at least 30 minutes
PREPARE TANG ZHONG: (prepare one day before)
Place milk and the bread flour in a small saucepan. Whisk until there is no more lumps. Cook this mixture over low-medium heat until it reaches 65 C (149 F). Remove from the heat and cover with a plastic wrap, touching the tangzhong so the skin won't form. I highly suggest using this the next day instead of using it on the same day. Store this in the fridge
MAKE THE DOUGH:
Mix all the dry ingredients together in a mixing bowl. Make a well in the center and pour in the wet ingredients and the tang zhong you made earlier. Use a dough hook attachment to knead the dough until all the crumbly dough starts to come together into one mass, it may take about 5 minutes for this to happen. Don't be tempted to add any liquid. You may need to stop halfway and scrape the dough off the hook and the sides of the bowl and knead again
Once you have a smoother dough, add the softened butter gradually. The dough will turn into a REAL sticky mess again because of the butter, just keep kneading and stop halfway and scrape the dough off the hook and bowl again and continue to knead until the butter is absorbed by the dough. IT WILL HAPPEN, don't worry! DO NOT be tempted to add any extra flour. You will get a shiny smooth dough that is very elastic and it reaches a window pane stage. When you stretch the dough slowly and thinly, it won't break. This may take about 15-20 minutes or longer to knead the dough to this stage on my kitchen aid stand mixer.
1ST PROOFING:
Place this dough in a lightly oiled large bowl, cover it with a clean and damp tea cloth or plastic wrap and let it rise at a warm place for about 1 hour. It may not double in size, but it will puff up some for sure.
SHAPING:
Punch the dough down, divide into 10 and round them up into dough balls. Cover these doughs loosely with a plastic wrap and let them rest for 15 minutes. Make sure you don't skip this part of resting the dough before shaping
When ready to use the custard, for the firm custard, portion into 10 portions and roll into balls for easier wrapping. For the soft custard, stir to loosen it so it's smooth and creamy again and transfer to a piping bag
TO TOP CUSTARD ON TOP OF THE DOUGH:
Take one dough and flatten with your palm to about 3-4 inch round. Dip a base of a round cup in a flour to prevent sticking and press the base of the cup on the dough to create a "crater" for you to pipe the custard filling
Pipe the filling into the crater. Proceed to 2nd proofing
TO WRAP THE FILLING INSIDE THE DOUGH:
Flatten one dough and roll into about 4-5-inch circle. Place one filling ball in the middle. Gather the edge of the dough to enclose and pinch to seal the bun. Place the seam side down on a baking pan lined with parchment paper and repeat with the rest of the dough. Cover with a plastic wrap or a clean kitchen towel and proceed to 2nd proofing
2ND PROOFING:
Let the dough proof again until they are about 1.5x their original size. It may take about 45 minutes to one hour, depending on the temperature. 10 minutes before the end of the proofing, preheat the oven to 375 F (190 C) for a conventional oven and 350 F (180 C) for a convection oven
BAKING:
Pop the baking sheet into the oven (3rd rack from the top) and let them bake for the next 15 minutes or golden brown on top
While the buns are baking, prepare the simple syrup by mixing sugar with hot water until sugar melts
When the buns are out of the oven, immediately brush the simple syrup on the buns (not on the custard if you pipe custard on top, brush on the bread part)
STORING:
Leftover buns with a firm custard can be kept at room temperature for 3 days. Leftover buns with creamy custard on top need to be kept in an air-tight container in the fridge for up to one week
REHEATING:
Wrap the buns in aluminum foil and reheat in oven or toaster oven or air fryer at 350F for about 10 minutes to warm up, or simply warm it in the microwave oven in a 30 seconds increment until warmed through