Seafood cocktail

INGREDIENTS

• 4 tablespoons low-fat mayonnaise, made with free-range eggs
• 2 tablespoons ketchup
• juice and finely grated zest of plus lemon wedges to serve 1 lemon
• a few drops Tabasco
• 1 splash Worcestershire sauce
• ½ small radicchio lettuce, shredded
• 2 little gem lettuces, leaves separated
• 200 g fresh white crab meat, from
• , ask your fishmonger
• 250 g large cooked and peeled prawns, from
• 1 large punnet cress, snipped
• a few pinches paprika