Briks are probably the best known Tunisian snack food, and are sold just about everywhere in Tunisia. They are traditionally made from the same type of paper-thin pastry as the warka pastry used in bisteeya. This is often sold as ‘brik’ pastry, but is hard to find, and filo will do just as well, or at a pinch, Chinese spring-roll wrappers. The fillings are numerous, but mashed tuna fish, spinach and cheese or creamy brains are favourites. Briks nearly always include an egg, which is broken onto the filling. The pastry is then carefully wrapped up and the whole parcel quickly deep fried. The idea is to eat them immediately, so the egg yolk is still runny when you bite into the crispy pastry.