Chashu Pork recipe / Japanese char siu / チャーシュー

[Ingredients] (4-5serves)

-Pork belly (Skin-on) 1kg
-Onion 1 each
-Green shallot 1 stalk
-Garlic 15g
-Ginger 15g
-Kombu (Dried kelp) 10g

-Water 1500ml
-Sake 3tbsp (45ml)
-Mirin 2tbsp (30ml)
-Egg some

[For the sauce]
-The cooking liquid 400ml
-Soy sauce 200ml
-Sugar 4tbsp (60ml)