Japanese Cheese Tarts

Tart shells

• 500 g low protein flour, plus extra for dusting
  or 500 g cake flour, plus extra for dusting
• 120 g caster sugar
• 300 g salted butter, cut in cubes (1 cm)
• 1 egg (50 g)

Molten cheese custard

• 500 g cream cheese, softened
• 60 g fresh milk
• 100 - 130 g caster sugar
• 200 g whipping cream
• 10 g rum (optional)
• 1 tbsp cornflour (starch)
• 2 tsp lemon juice
• ¼ tsp vanilla extract
• 1 egg yolk, lightly beaten