Ramen, pork and spinach soup

Ingredients

• 1 kilogram chicken necks
• 3 litre water
• 1 large_piece leek (500g), chopped coarsely
• 5 centimetre piece fresh ginger (25g), sliced thinly
• 10 black peppercorns
• 250 gram fresh ramen noodles
• 1/4 cup (60ml) japanese soy sauce
• 1/4 cup (60ml) cooking sake
• 1 teaspoon sesame oil
• 300 gram spinach, trimmed, chopped coarsely
• 200 gram piece chinese barbecued pork, sliced thinly
• 1 fresh long red chilli, sliced thinly
• 1/2 sheet nori, cut into 2cm pieces