Mille-feuille is a sophisticated French pastry. It translates to "thousand sheets" and is made up of alternating layers of pastry and filling. This is a savoury recipe for mille-feuille with layers of puff pastry and prawn, avocado and cucumber mousse. An impressive starter for a dinner party.
Assemble the mille-feuille just prior to serving so that the pastry does not go soft.