BBC Food - Recipes - Crab and salmon roll with brown crab ketchup

Ingredients

• 250g/9oz salmon , pin boned and skinned
• pinch sea salt
• 25ml/1fl oz double cream
• 120g/4¼oz white crab meat
• 1 tbsp chopped coriander
• 1 tbsp chopped basil
• 1 tbsp chopped parsley
• ¼ lime , zest only
• ¼ lemon , zest only
• 450g/1lb ready-made puff pastry
• 1 free-range egg, beaten for egg wash
• ½ leaf gelatine , soaked in cold water for 10 minutes
• ½ lemon , juice only
• 110g/4oz brown crab meat
• dash of Worcestershire sauce
• 1 tsp English mustard
• 1 tsp anchovy essence
• 2 tsp tomato ketchup
• 1 egg yolk
• 1 tbsp fresh white breadcrumbs
• 110ml/4oz vegetable oil
• 4 tbsp rapeseed oil
• salt and freshly ground black pepper