4 stalks hajikami or 50²µ/1¾´Ç³ú pickled ginger, to serve
500g/1lb 2oz large leaf spinach
125²µ/4½´Ç³ú caster sugar
50²µ/1¾´Ç³ú sesame seeds
2 tbsp dark soy sauce
200ml/7fl oz dashi stock or fish stock
1 tbsp caster sugar
4 black cod fillets, about 150–200g/5½–7oz each, pin-boned
100ml/3½fl oz mirin
50²µ/1¾´Ç³ú lotus root or taro chips, to serve, optional