Black Pepper Buns (Hujiao Bing)

Ingredients

• 450g minced pork
• 2tsp ground black pepper
• 2tsp ground white pepper
• 1 tsp ground Szechuan pepper
• 1 ¼ tsp salt
• 4 tbsp light soy sauce
• 2 tsp sugar
• 2 tsp sesame oil
• 2 tsp corn flour
• 100ml water
• 100g spring onions, chopped
• 335g all purpose flour
• 225ml water
• 7g instant yeast
• 22g sugar
• ½ tsp salt
• 64g lard or vegetable shortening
• 95g pastry or low protein flour
• 2 tbsp water
• 1 tbsp sugar
• ¼ cup toasted sesame seeds