Grilled halibut with green sauce

INGREDIENTS
6 chunky halibut fillets, about 140g (5oz) each
1 tbsp olive oil
salt and freshly ground black pepper
lemon wedges, to serve
For the green sauce
45g (11⁄2oz) mixed herbs, such as parsley,
chives, mint, tarragon, and chervil
2 garlic cloves
8 tbsp olive oil
1 tbsp tarragon vinegar
salt and freshly ground black pepper
pinch of caster sugar

METHOD
Place all the ingredients for the sauce in a food processor, process until smooth, and season to taste with salt and pepper, and the pinch of caster sugar. Chill until needed.
Preheat the grill on its highest setting. Lightly brush the halibut with oil, and season to taste with salt and pepper. Cook the fish for 2 minutes on each side, and serve with the green sauce and lemon wedges to squeeze over.