Place 2 parcels onto a microwave-safe plate. Cook in the microwave on a high setting for 10 minutes until the fish is cooked through and the parcels have expanded. Leave them to rest for 2 minutes ...
Set aside the fish. Sprinkle the flour over the warm milk, whisk in thoroughly and then whisk in the butter. Place the bowl in the microwave, cover and cook on HIGH for 2 minutes 30 seconds (1000W ...