For the dough
10.6 oz (300 g) all-purpose flour and more for dusting (See Note 1)
Scant 2 Tbsp. (20 g) sugar (See Note 2)
1/2 tsp. salt
1 tsp. baking powder
1 tsp. instant dry yeast
1 Tbsp. canola oil (or vegetable oil)
160-170 ml (160-170 g) water (See Note 3)

For the filling
2 dried shiitake mushrooms
1/2 cup water
1 scallion/green onion
4 large cabbage leaves (180 g)
1 tsp. salt
3/4 lb. (340 g) ground pork
1" (2.5 cm, 15 g) ginger
1 tsp. sugar
1 Tbsp. sake
1 Tbsp. soy sauce
1 Tbsp. sesame oil
1 Tbsp. potato/corn starch
Freshly ground black pepper