- 1.
**Prepare the Char Siu Pork:** In a large bowl, combine hoisin sauce, soy sauce, honey, rice wine vinegar, grated ginger, minced garlic, cinnamon stick, star anise, five-spice powder, red food coloring (if using), and sesame oil. Add the pork cubes and mix well to coat. Cover and marinate in the refrigerator for at least 4 hours, or preferably overnight.
- 2.
Preheat oven to 350°F (175°C). Place the marinated pork on a baking sheet lined with parchment paper. Bake for 1 hour, flipping halfway through, or until cooked through and slightly caramelized. Baste with the marinade during the last 15 minutes of cooking for extra flavor and glaze.
- 3.
Remove the cinnamon stick and star anise, let the pork cool slightly, then chop into small pieces. Set aside.
- 4.
**Make the Bao Buns:** In a large bowl or the bowl of a stand mixer, combine the flour, instant yeast, baking powder, sugar, and salt.
- 5.
Gradually add the warm water and vegetable oil, mixing until a shaggy dough forms. Knead the dough for 8-10 minutes, either by hand or with a dough hook, until it becomes smooth and elastic.
- 6.
Place the dough in a lightly oiled bowl, turning to coat. Cover and let rise in a warm place for about 1 hour, or until doubled in size.
- 7.
Punch down the dough and divide it into 8 equal portions. Roll each portion into a ball.
- 8.
On a lightly floured surface, flatten each ball into an oval shape, about 4 inches long and 3 inches wide. Brush the surface lightly with vegetable oil.
- 9.
Fold the oval in half to create a half-moon shape. Place each folded bun on a small square of parchment paper.
- 10.
Place the prepared buns in a steamer, leaving some space between each bun. Let them rest for another 15-20 minutes to proof slightly.
- 11.
Bring water to a boil in the steamer. Steam the buns for 12-15 minutes, or until they are puffy and cooked through. Be careful not to overcrowd the steamer; you may need to steam them in batches.
- 12.
Remove the buns from the steamer and let them cool slightly. Carefully open each bun and fill with the prepared cinnamon-spice char siu pork.
- 13.
Serve immediately and enjoy!