Sweet Pastry Tartlets

Sweet Shortcrust Pastry

• 100 g caster sugar
• 200 g unsalted butter, diced (1 cm) then frozen for 30 minutes
• 370 g plain flour
• 1 medium egg
• 1 pinch fine sea salt
• 1 ½ tsp vanilla sugar, homemade
  hoặc 1 tsp natural vanilla extract, homemade