Steamed sea bass in the bag

Name: Steamed sea bass in the bag
Ingredients: 6 lime leaves; 1–2 sticks lemon grass, chopped; 1 clove of garlic, finely sliced; 1–2 red chillies, to taste, seeded and chopped; a small tablespoon of freshly grated ginger; a handful of coriander, leaves picked and stalks reserved, plus extra to serve; 1 tablespoon Kikkoman low-salt soy sauce; 1 lime, zested and halved; 2 tablespoons olive oil; 2 nice thick fillets of sea bass, from sustainable sources, ask your fishmonger – about 200g each; 1 free-range egg white; a small wine glass of sake