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.

James Tanner's classic prawn cocktail has extra sweetness and crunch ... and stored in the fridge for 2-3 days and used for other recipes). Sprinkle with a little cayenne pepper, and top with ...