Possible Clues:

• Trattoria entree
• Is upset, internally affected by seafood
• Made with garlic and butter
• Is coming back round tent-site with prawns
• Shellfish
• Rascal's taken to one type of sea food
• Prawns cooked in a batter
• Seafood can almost make people ill, initially
• Crustaceans - almost the very same river contained
• Trick played on relation with seafood