Chinese Pork Belly Bun (Rou Jia Mo, 肉夹馍)

Ingredients

• 3 1/2 pounds pork belly *Footnote 1, cut into 2-inch, 4.5-cm chunks
• 4 dried chili peppers
• 3 cloves
• 1 whole nutmeg or 1/8 teaspoon nutmeg powder
• 1 whole star anise
• 1 cinnamon stick 5 centimeters / 2 inches in length
• 2 pieces ginger
• 4 green onions halved lengthwise
• 1/4 cup Shaoxing wine or dry sherry
• 1/4 cup light soy sauce or soy sauce
• 2 teaspoons dark soy sauce or soy sauce
• 1 tablespoon sugar
• 1/4 teaspoon salt
• 10 flatbreads homemade, or store-bought pita bread
• 1 cup cilantro chopped
• 2 bell peppers cubed, *Footnote 2
• Sriracha sauce optional
• chili oil optional