Cheat's Mille-feuille

Mille-feuille is French for a 'thousand leaves' - a nod to the many layers of this dessert, and specifically the thin layers within the pastry layers. Using ready-made ingredients this is ready from fridge to table in 15 mins. For 6 people you'll need:

• 300g Puff Pastry (shop bought is often 340g portions - that's fine!)
  
• 300 ml Double Cream
  
• 300g Jam (Raspberry here)
  
• 1 Egg
  
• Icing sugar to decorate