Crystal Pork & Jicama Dumplings (水晶饺子) (Gok Zai)

Filling:

• 1 tablespoon vegetable oil 菜油
• ¼ C dried shrimp rinsed and soaked, optional, 蝦米
• 250 g ground pork lean, aka 豬肉碎
• 1 tablespoon soy sauce 醬油
• ⅛ teaspoon black pepper Chinese name 黑胡椒
• ½ tablespoon granulated sugar 砂糖
• ¼ teaspoon sea salt 鹽
• 6 cloves garlic minced, aka 蒜
• 1 jicama shredded thinly, small, ~600g, aka 沙葛
• 1 carrot shredded, large, aka 胡蘿蔔
• ¼ C leek shredded, note: 大蒜 is usually garlic
• 1 tablespoon oyster sauce 蠔油
• 1-2 tablespoon all-purpose flour or more, depending on how wet the mixture is, 麵粉

Dough:

• 360 g wheat starch aka 小麥澱粉
• 70 g rice flour aka 米粉
• 70 g tapioca starch 菱粉
• 600 ml water hot, boiling, aka 沸水
• 10 ml vegetable oil 菜油

For brushing:

• 1 teaspoon sesame oil 麻油