Inside-Out Mochi Chocolate Ganache Buns

Course: Baked Buns

Cuisine: Asian American

Prep Time: 30

Cook Time: 30

Proof the dough twice and chill the ganache:: 4

Total Time: 5

Servings: buns

Calories: 348kcal

Author: Marvellina

Soft tangzhong milk buns filled with rich chocolate ganache, baked until fluffy, then wrapped in chewy mochi dough and dusted with cocoa powder.

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US Customary - Metric

Ingredients

Tangzhong

30 g bread flour 12.7% protein content plus more for dusting
150 g whole milk

Dough

300 g bread flour 12.7% protein content plus more for dusting
5 g instant yeast
28 g milk powder
100 g whole milk add more as needed
50 g egg about 1 large egg
7 g salt
40 g sugar
40 g unsalted butter softened

Mochi dough:

175 g glutinous rice flour
20 g cornstarch
45 g sugar
270 g milk
30 g unsalted butter
1 tsp Dutch cocoa powder plus more for dusting the dough during wrapping

Chocolate ganache filling: (prepare this the day before)

113 g semi-sweet chocolate chips or baking bars, chopped
60 g heavy cream
1 ½ tsp unsalted butter
½ tsp all-purpose flour
⅛ tsp salt
¼ tsp vanilla extract

Instructions

Prepare the chocolate ganache filling: (Prepare this the day before)

Place chocolate chips in a heat-proof bowl. In a small saucepan, heat the heavy cream until it just begins to simmer (do not let it reach a rolling boil). Pour the hot cream over the chocolate. Let it sit undisturbed for 5 minutes.
Whisk the mixture gently, starting from the center. Once smooth, whisk in the butter, salt, and flour
Pour the ganache into a shallow dish. Cover with plastic wrap (touching the surface) and refrigerate until completely firm (at least 2 hours, or best, overnight).

Prepare tangzhong:

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) if you have a instant-read digital thermometer. Otherwise, it’s about 1 1/2-2 minutes.
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
If you decide to use it on the same day, let it cool down to lukewarm before mixing with the rest of the ingredients

Make the dough:

Add the rest of the ingredients for the dough, except for the butter, into the mixing bowl of a stand mixer fitted with a dough hook attachment. Make a well in the center and pour in the wet ingredients and the tangzhong. Start the machine and knead the dough on speed 2 until the dough starts to come together into one sticky mass, about 3 minutes
Increase the speed to 4 and continue to knead until the dough is relatively smooth. You need to stop and scrape the dough off the hook and the bowl several times during this process
Gradually add the butter, one pat at a time. It is 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. Don’t add any flour. You will get a shiny smooth dough that is very elastic and sticky. It may take 10-15 minutes of kneading with a machine on speed 4.
The dough will clear the sides of the bowl but still stick to the bottom of the bowl and that's ok.
If you gently stretch a small amount of the dough slowly, it shouldn't break easily. This shows that the dough has good gluten development already and you can stop kneading

First 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. The dough will puff up and double in volume.
When you poke your finger into the dough, the indentation stays and the dough won’t deflate

Shape the chocolate ganache filling:

While the dough is proofing, get the chocolate ganache you have prepared from the fridge. Scoop chilled ganache into 1-tablespoon balls.
Freeze the ganache balls for at least 30 minutes before stuffing into the dough.

Shaping:

Line 2 large baking pan with parchment paper
Deflate the dough and push all the air out. Divide the dough into 12 equal pieces. Round them up into dough balls. Keep them covered and work with one dough at a time
Flatten the dough into about 4-inch disc. Place one chocolate ganache filling on the center.
Gather the dough around it to enclose the filling.
Pinch the dough seams tightly at the bottom. This is to prevent the chocolate from leaking onto the pan during baking.
Repeat with the rest of the dough and filling. Place the shaped buns on a prepared pan, seam-side down. Depending on the size of your baking pan, you want to allow about 2 inches in between each dough

Final proofing:

Let the shaped dough proof again for another 1 hour or until they are puffy, but not necessarily double in volume. Try not to proof them at too warm of a temperature to prevent the ganache from getting too soft. Around 75 -78 F (24 C -26 C) is okay, but not warmer than that. So proofing may take a bit longer due to slightly cooler temperature

Baking:

10 minutes before the end of the final proofing, preheat the oven to 350 F (180 C) for conventional oven, 330 F (165 C) for convection oven. Position the oven rack in the middle of the oven
Place the baking pan in the positioned rack. Bake for 20-25 minutes or until the top is just lightly golden brown. If you have an instant digital thermometer, it should read at least 190 F (88 C)
Remove from the oven and transfer them onto a cooling rack to let them cool down completely before wrapping each bun with mochi dough

Prepare the mochi dough:

I use a steamer to cook the dough. Bring the water in a steamer to a boil
Combine the glutinous flour, cornstarch, sugar, and milk in a mixing bowl. Make sure to whisk until they are combined thoroughly
Oil a shallow plate and pour the mixture onto the plate. Cover with a cling wrap and steam for about 20-25 minutes.
A toothpick should come out clean
Proceed to "knead the mochi dough" step

To cook mochi dough in the microwave:

Combine all ingredients in a microwave-safe bowl. Cover the bowl with a microwave-safe lid or cling wrap. Poke a few small holes in the wrap to allow steam to escape.
Microwave on high for 2 minutes. Remove and stir the batter with a silicone spatula.
Continue microwaving in 1-minute intervals, stirring each time, until the mixture thickens and becomes sticky and translucent. Usually, this takes about 4–6 minutes total, depending on your microwave wattage.
Proceed to "knead the mochi dough" step

Knead the mochi dough:

Let it cool down for about 2-3 minutes and then scrape the dough onto an oiled silicone mat if you have one. Otherwise parchment paper may work in a pinch
Use the silicone mat to help you "knead" the dough. The dough is still very warm and that's why the silicone mat comes in handy here. If you use parchment paper, you may want to wear a kitchen mitten so it won't be too hot for your hands
Keep kneading until the dough is really soft and pliable. Halfway through kneading, add the cocoa powder and continue to knead until it is evenly distributed. .
This kneading process is what gives the mochi its amazing pliable stretchy texture
You can also put the dough in a standmixer bowl and use the flat beater to beat the dough until it is soft and pliable

Final assembling:

Divide the dough into 12 equal portions
Lightly dust the dough with a bit of cocoa powder to prevent it from sticking. Roll it out into a circle, bigger than the baked bun. Place the baked bun, upside down, then gather the seam to enclose the bun entirely and pinch it together to seal the mochi dough.
The seam is at the bottom. Continue with the rest of the mochi dough and baked buns
Dust with some cocoa powder to prevent the dough from sticking

Serving:

These are best served on the same day.

Storing:

If you do have leftovers, wrap each bun tightly with a cling wrap and keep in an air-tight container. The mochi dough stays soft for 2-3 days if you keep it covered tightly
If it starts to harden, simply microwave it for a few seconds and it will soften again and as good as new

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