Apple tart

Pastry

• 75 g butter, unsalted, chilled, cut in pieces, plus extra for greasing
• 150 g flour
• 1 pinch salt
• ½ tsp vanilla sugar, homemade
  或 ¼ tsp natural vanilla extract
• 50 g water
• flour, for dusting

Topping

• 900 - 1000 g apples (e.g. Reinette, Granny Smith, Braeburn, Pink Lady, Pippin, Gravenstein)
• 30 g sugar
• 10 g butter