Japanese Braised Pork Belly (Buta no Kakuni)

Name: Japanese Braised Pork Belly (Buta no Kakuni)
Prep time: 1 h 5 min
Cook time: 2 h
Total time: 3 h 5 min
Cuisine: Asian, Japanese
Ingredients: 350-450g pork belly block (approx 1lb); 2 thumbs of fresh ginger (30g / 1oz); 1 Welsh/green onion (approx 100g); 500ml (2 cups) of cooking water from pork; 100ml beer; 1 tbsp honey; 2 tbsp light brown sugar; 100ml soy sauce; 4 soft boiled eggs (optional); Spring onion to garnish (optional); Japanese mustard or hot English mustard (optional)