Fillet of John Dory Mazarin

• 4 pieces white of leek, 20cm long and 4.5cm wide

Bring a saucepan of salted water to the boil and blanche the strips of leek for 30 seconds. Refresh in iced water, drain and lay on a clean tea towel to extract any excess water. When dry, use a sharp knife and scrape the back of the leek to remove any stringy bits, leaving thin transparent pieces of leek. Liberally brush 4 pastry rings, 4