Japanese Pot Stickers

Name: Japanese Pot-Stickers
Ingredients: 3-1/2 ounces cake flour; 3-1/2 ounces bread flour; Additional flour for dusting; 1/4 teaspoon salt; Stuffing Ingredients; 5 ounces ground pork; 1 teaspoon shoyu (soy sauce) plus more for dipping; 3-1/2 ounces spinach leaf part only, chopped; 1 portobello mushroom chopped; 1/2 teaspoon salt; 2 garlic cloves grated; 1 teaspoon grated ginger; 2 tablespoons chopped garlic chives; Pinch of sugar; 4 tablespoons sesame or vegetable oil; Japanese hot mustard paste or French smooth mustard paste