Avo prawn cocktail - Australian Avocados

Ingredients

• 300g cooked and peeled all Aussie king prawns
• 2 ripe medium hass/shephard avocados
• juice of 1 lemon
• mixed lettuce leaves (as required)
• 1 lemon cut into 6 wedges
• salt and freshly ground black pepper
• 8 tbsp light mayonnaise
• 4 tbsp crème fraîche
• 6 tbsp ketchup
• 2 tbsp creamed horseradish
• 1½ tsp tomato purée
• juice of ½ lemon
• a dash of sugar