The Parmesan crust, she tells us, complements the rich, fatty fish with its salty ... To make the sauce, you'll also need white wine, heavy cream, garlic, Dijon mustard, lemon zest, chives ...

You can also use cream cheese to make a rich and luscious sauce ... the fish before cooking. Alternatively, try mixing together sour cream, wholegrain mustard, and Parmigiano-Reggiano or parmesan ...