Kaya Kok (Kaya Puffs)

Oil dough

• 125 g plain flour, plus extra for dusting
• 80 g butter, cold
  hoặc 80 g margarine, cold

Water dough

• 175 g plain flour, plus extra for dusting
• 1 pinch salt
• 25 g icing sugar
• 40 g butter, cold
  hoặc 40 g margarine, cold
• 95 g water
• 220 g kaya, homemade or store-bought, chilled
• 1 egg yolk