Fried Bone Juices

• 700 ml (24 fl oz) vegetable oil
• Bones from 2 small mackerel

Heat the vegetable oil in a saucepan to 180°C (350°F) and fry the fish bones until brown and crisp. Put the bones in a deep saucepan and add the onion, garlic, white soy sauce, kelp and 600 ml (21 fl oz) w