Snapper and clams en papillote with tarragon beurre blanc

1.For tarragon beurre blanc, bring white wine, shallot, thyme, bay leaf, tarragon stalks, star anise, white pepper, fennel and coriander seeds to the boil in a large saucepan and reduce to 75ml (10-15 minutes). Strain into a clean saucepan and bring to a simmer over medium heat, then whisk in cream. Reduce heat to very low and gradually whisk in butter a piece at a time until thick and smooth, then stir in tarragon leaves and season to taste. Keep warm.

2.For saffron leeks, melt butter in a saucepan over medium heat. Add leeks and saffron, season to taste, reduce heat to low and sauté, stirring occasionally, until almost tender (2 minutes). Add cream and simmer, stirring occasionally, until leeks are tender (2-3 minutes). Set aside.

3.Preheat oven to 180C. Place a sheet of foil large enough to enclose one of the snapper on a work surface and top with a sheet of baking paper. Spread half the saffron leeks in the centre to cover an area slightly smaller than the fish, then top with a snapper, half the clams and cover with half the beurre blanc. Place another sheet of baking paper on top, cover with another sheet of foil, then fold edges around fish to enclose and seal well. Repeat with remaining ingredients to make a second parcel. Bake on a tray until a thermometer inserted into the parcel reads 52C or a skewer inserted is warm to hot when touched to your lips (28-30 minutes). Open parcels carefully as hot steam will escape and serve fish from parcel with potatoes.