How to Make My Grandmother's Amazing Gyoza in a Gyoza

Ingredients

• 2 cups all-purpose flour (240 g)
• ½ teaspoon salt
• ¾ cup warm water (180 ml)
• 1 cup ground pork (or chicken) (250 g)
• ½ cup finely chopped napa cabbage (75 g)
• 2 green onions, finely sliced
• 1 tablespoon grated ginger
• 2 cloves garlic, minced
• 1 tablespoon soy sauce
• 1 teaspoon sesame oil
• Freshly ground black pepper to taste
• Cooking oil (for frying)