Salmon with shiitake and bok choy

Ingredients

• 1 stalk lemongrass
• 2 tablespoon peanut oil
• 4cm piece ginger, sliced
• 2 shallots, chopped
• 1-2 large mild chillies, sliced
• 100g shiitake mushrooms, sliced
• 1 teaspoon sugar
• 250ml fish or vegetable stock
• 4 bok choy, sliced lengthways
• 4 fillets salmon, about 180g each
• 3 tablespoons soy sauce
• 1 tablespoon honey
• 1 tablespoon lime or lemon juice
• half a cup fresh coriander and/or Thai basil leaves