• 

  Gruyère cheese (可选的) cut into pieces

  2 oz

Pastry

• 

  unsalted butter cold and cut into pieces, plus extra to grease

  3 oz
• 

  all-purpose flour plus extra to dust

  6
• 

  salt

  ½ tsp
• 

  cold water

  2 oz

Filling

• 

  cubed bacon (see Tip)

  7 oz
• 

  large eggs

  4
• 

  whole milk

  2 oz
• 

  crème fraîche

  3 ½ oz
  3 ½ oz cream
• 

  salt

  ¼ tsp
• 

  ground black pepper

  2 pinches