Steamed fish with ginger & spring onion

INGREDIENTS

• 100g pak choi
• 4 x 150g fillets firm white fish
• 5cm piece ginger , finely shredded
• 2 garlic cloves , finely sliced
• 2 tbsp low-salt soy sauce
• 1 tsp mirin rice wine
• 1 bunch spring onions , finely shredded
• handful coriander , chopped
• brown rice , to serve
• 1 lime , cut into wedges, to serve