Ingredients

BRAISED PORK BELLY:
• 17.6 oz (500 grams) skin-on pork belly
• 4~5 (40 grams) scallions, cut into short sections
• 1 tbsp vegetable oil
• 1 1/2 tbsp (20 grams) light brown sugar
• 3 cloves garlic, minced
• 1/4 cup (60 grams) shaoxing wine, or rice wine
• 1/4 cup (60 grams) soy sauce
• 2~3 bay leaves
• 2 star anise
• 1/8 tsp ground cinnamon
DOUGH:
• 2 cups (250 grams) bread flour
• 3 1/2 tbsp (50 grams) granulated sugar
• 2 tsp (3 grams) instant dry yeast
• 1/2 tsp salt
• 2/3 cup (147 grams) water
FILLING:
• 1/4 cup drained pickled capers
• 2 tsp vegetable oil
• 1/2 tsp granulated sugar
• 1/2 tsp rice vinegar
• smooth peanut butter

Instructions

1. PREPARE PORK BELLY: Cut the pork belly into 1" (2.5 cm) dices, set aside. In an oven-proof pot, heat vegetable oil and cook the scallions until browned all over and shriveled, then remove with a slotted spoon and set aside. Add the diced pork belly and cook until the edges are slightly browned and some of the fat is being rendered out. Pour all the fat out of the pot, then add the light brown sugar. Continue to cook, stirring frequently, until the edges of the pork belly and the sugar are caramelized. Now add the scallions back in along with garlic. Cook for 1 min until fragrant, then add shaoxing wine, soy sauce, bay leaves, star anise and ground cinnamon. Bring to a simmer, put the lid on, then transfer into a 300 F/150 C oven. Give it a stir every 30 min, and cook for about 1:40 ~1:50 hour until it's melty tender (if it looks like there's no more liquid left at any point during cooking, just add a bit more shaoxing wine).
2. Remove the bay leaves and star anise, and skim off most of the fat off of the surface. Then transfer into an air-tight container and chill until completely cold, at least 6 hours or overnight.
3. PREPARE DOUGH: In a stand-mixer with dough-hook, combine bread flour, granulated sugar, instant dry yeast, salt and water. Knead on medium speed until incorporated, then turn to high speed and knead for 10 min until extremely smooth and elastic. The dough should pull away cleanly from the sides and bottom of the bowl during mixing, but should be soft and pliable. If it's sticking to the bowl during mixing, add more flour. If it feels stiff and dry, add a bit more water. Cover with plastic wrap and let rise in a warm place until fully doubled, about 2~4 hours depending.
4. MAKE THE BUN: In a small skillet, combine drained capers, vegetable oil, sugar and rice vinegar. Cook on medium-high heat, stirring constantly, until the capers are slightly browned and shriveled. Set aside to cool completely.
5. Transfer the dough to a lightly floured surface and fold it over itself a couple times, then divide into 17 equal portions. Tuck each portions under itself to shape into a tight ball, then let rest and relax for 10 min. Take a small saucer about 2 1/2" in diameter, then place 1 dough ball inside. Use your fingers to press and spread the dough outwards until it drapes over the edges with a dent in the middle (the edges should be slightly thinner than the center). Place 1 piece of braised pork belly in the middle, 6~7 fried capers, and a little less than 1/2 tsp of smooth peanut butter. Bring the sides of the dough together and pinch to close tightly. Repeat with the rest.
6. You can freeze the buns now until hard, then keep in an air-tight bag until needed. If you're freezing them, take them out 6 hours before serving. Place each on a small piece of parchment paper, cover with plastic-wrap, and let thaw and proof until almost doubled (about 80%). If your place is warm and the buns are rising too fast, simply place them in the fridge to slow down. If you are not freezing the buns, it will only take about 1~2 hours for the to almost double.
7. Place in the steamer and steam on high heat for 7~8 min.