Prepare the apple pie filling (can be prepared few days before):
Cut the apples into small cubes. Toss together with the rest of the filling ingredients, except for cornstarch, coconut oil/butter, and vanilla extract in a large pan or saucepan. Let them sit at room temperature for about 10 minutes
After that, put the pan on the stove and cook over medium-low heat and cook until the apples soften, about 10 minutes or so. Don't crank up the heat too high or the liquid will evaporate too quickly. We want a moist filling
When the apple has softened, stir in vanilla extract and coconut oil/butter. Stir to combine. Have a taste and add more sugar if you think it needs more. Adjust it to your preference. Mix cornstarch with water to make a slurry. Pour this over the apple mixture and stir until the apple mixture has thickened. Set aside to let the mixture cools down completely before wrapping. If you prepare a few days before, let it cools down completely, then cover and keep it in the fridge. They can be kept in the fridge for no more than one week
Divide the filling into 8 portions. They should stick together pretty well for easier wrapping
Prepare the dough:
Place the flour/starch combination, instant yeast, sugar, salt, and oil in a mixing bowl. If you are using a stand mixer, use a dough hook attachment. Add cold milk or room temperature water. Knead on speed 2 until you can form a dough. Add milk, one tablespoon at a time if the dough seems dry and won't come together
Knead for about 5 minutes. The dough won't be entirely smooth yet, but it should come together as one dough. Divide the dough into two. Pinch off about 10 grams of the dough for the stems. Cover them with plastic wrap so they won't dry out
Prepare the red dough (for red apples):
Add red yeast rice powder to the dough in the mixing bowl and continue to knead at speed 2 until the dough is smooth and elastic, about 8-10 minutes. If the dough seems a bit dry, add a bit of milk, 1 teaspoon at a time. You may or may not need to, just observe the dough. When it's done kneading, remove from the bowl and keep it covered
Prepare the green dough (for green apples):
Put another dough into the bowl and add matcha powder. Continue to knead at speed 2 until the dough is smooth and elastic, about 8-10 minutes. If the dough seems a bit dry, add a bit of milk, 1 teaspoon at a time. You may or may not need to, just observe the dough. When it's done kneading, remove from the bowl and keep it covered
Rest the red and green dough for about 10 minutes. Keep them covered
To make the stems and the leaves:
Pinch off about 10 grams of the green dough aside to make the leaves. Divide into 8 pieces to make 8 leaves. Simply flatten the dough with your fingers and shape into a leaf shape. Keep them covered
Mix the small dough that you pinch off with the cocoa powder (to make the stems) and knead until the dough evenly picks up the color. Add a tiny bit of water if the dough is a bit too dry. Divide this into 8 pieces to make 8 stems. Shape each tiny dough into a stem-looking shape. Keep them covered
Wrapping and shaping:
Divide the red and green dough into 4 each, so you have a total of 8 smaller doughs now. Keep them covered
Take one dough, flatten slightly with your palm and roll into a 4-5 inch round. Put one portion of the filling in the middle of the dough. Gather the edge to center and twist and pinch to seal. Make sure it's well sealed so the filling won't leak out. Place the seam side down. Use a chopstick or something else about that size to gently create a depression in the center of the dough. Lightly wet the tip of your index finger and rub it on the depression and put the stem in there and the leaf next to it. Wet your finger as needed to "glue" them to the apple. Place this in a muffin cup liner
When you put the apples in the muffin cup liner, they will expand to the side slightly after steaming. I also tried to put some in large muffin cups lined with the liner and put the apple inside. The cup helps to keep the shape of the apple "taller". But don't worry about it if you don't have cups to do that. I just happened to have cups with the size perfect for this. Comtinue with the rest
Proofing:
Once you are done with shaping, mist the shaped buns lightly with some water, cover with a clean kitchen towel and put them in a warm place to let them proof for about 1 hour or until the dough feels lighter and when you gently press of it, it will gradually bounce back. They won't double in size, but should puff up and feel lighter. If not, let them proof a bit longer. Don't go by the time, but observe the dough. The proofing takes longer if the temperature is colder where you are
Steaming:
5 minutes before the end of the proofing time, bring the water in the steamer to a boil and then lower to medium. Wrap the lid of the steamer with a cloth to prevent condensation from dripping down on the surface of the buns, creating burn spots. If you use a bamboo steamer, you don't have to wrap the lid
Place the proofed buns in the steamer, about 1 inch from each other. Put the lid back, but don't close it all the way, leaving about 1/2-inch gap to let some steam escape. This part is important so the steamed buns will have smooth surface and won't "wrinkle". Maintain the heat at medium, DO NOT steam on high heat
Steam for about 8-10 minutes and then turn off the heat, don't take them out or open the lid yet. Leave them in the steamer for about 1-2 minutes and then carefully uncover the lid and remove the steamed buns to a cooling rack immediately to prevent the bottom from getting soggy because of condensation
Serving:
The apple steamed buns are best served warm
How to store:
Let the steamed buns cool down completely. Wrap each bun with a cling wrap and put them in an air-tight container or zipper bag. They can be kept at room temperature for about 3 days. For longer storage, freeze them for up to one month
How to reheat:
Room temperature steamed buns can be reheated in the steamer over medium heat for 3-5 minutes or until warm. You can also reheat them in a microwave, for 8-10 seconds or until warm
If they are frozen, you can let them sit on the counter for 10-15 minutes and then reheat by steaming until they are heated through or use a microwave
Notes
You can use Fuji apples, Honey Crisp apples, Pink Lady, Braeburn, or mix the red apples with Granny Smith for some tartness. The amount of the sugar depends on the sweetness of the apples you use.