Baozi (Chinese steam rolls)

Ingredients

• sugar – 2 tablespoons
• granular dry yeast – 7 grams
• "Makfa" superior grade wheat flour – 400 grams
• baking powder – 1 teaspoon
• baking soda – 1/5 teaspoon
• sesame oil – 1 tablespoon
• 1 piece of ginger root 4–5 centimeters long
• green onion – 1 bunch
• vegetable oil – 2 tablespoons
• minced pork – 400 grams
• soy sauce – 3 tablespoons
• mirin – 2 tablespoons
• garlic – 2 cloves
• starch – 1 tablespoon
• salt
• pepper