Chubby Hubby - Dad's Shandong-style Jiaozi, the best dumplings in the world

Ingredients

• 250g plain flour
• 125ml cold water
• 500g ground pork (not too lean. Remember, fat is flavour!)
• 125ml water
• 2 tablespoons soy sauce
• 2 tablespoons Shaoxing wine (or dry sherry)
• 1 egg
• 1 tablespoon toasted sesame oil
• 1 tablespoon minced peeled fresh ginger
• 50g dried shrimps (“hae bee”), soaked till soft, drained and finely chopped
• 500g grated and chopped courgette (zucchini)
• 250g finely chopped Chinese chives (“koo chye”)
• Salt and pepper to taste
• 125ml soy sauce
• 2 tbsp. Chinese black vinegar or rice vinegar
• 1 tsp. sesame oil
• 1 teaspoon of chili paste or oil (optional)