Every Christmas, when I was younger, it was the simple sauce I was in charge of to serve drizzled onto the prawns for our Christmassy starter. This year, I came across John Torode's Marie Rose ...

Done right, a prawn cocktail is a beautiful Christmas starter - and John Torode's the man to show you how. Bring a large pan of water to the boil and add a squeeze of lemon and glug of vinegar.