Roast sea bass with chilli & lime leaves

Name: Roast sea bass with chilli & lime leaves
Cook time: 15 min
Total time: 15 min
Cuisine: Asian, Thai
Ingredients: 2 tbsp each sunflower oil, sesame oil and caster sugar; 4 tbsp each Thai fish sauce and rice wine vinegar; 4 garlic cloves , crushed; 2 tbsp sunflower oil; 2 red onions , very thinly sliced; 2 fennel bulbs , halved and very thinly sliced; 1 fresh red chilli , deseeded and finely chopped; 3 lime leaves , very finely shredded; 4 tsp very finely chopped lemongrass; 5 tbsp chopped fresh coriander; 2 x 675g/1½lb sea bass , descaled and filleted; 6 long outside leaves from spring onions or two knotted together, for tying (See 'try' below)