Monkfish with lemon dressing

Name: Monkfish with lemon dressing
Ingredients: 4 boneless monkfish medallions, about 140g/5oz each; 1 stalk lemongrass bashed and finely chopped; 4 lime leaves chopped; 1 tsp lemon thyme leaves; 5 tbsp extra-virgin olive oil plus extra for frying; handful wild rocket leaves, to serve; strips of zest from 2 lemons pith removed; 25g caster sugar; 6 tbsp extra-virgin olive oil; 2 tsp lemon juice; ½ tsp coriander seeds, toasted, then ground; ½ tsp black onion seeds; 2 tbsp currants; 4 tbsp whole blanched almonds; 2 tbsp roughly chopped coriander