Portuguese Egg Tarts - Le-Thermique

Ingredients

• 200 g ice cold butter chopped into small pieces
• 200 g all-purpose-flour
• 90 ml ice water
• ½ tsp salt
• 250 g golden caster sugar
• 200 g ice cold water
• 2 strips lemon zest
• 2 eggs
• 4 egg yolks
• 50 g corn flour
• 500 g whole milk
• ½ tsp vanilla extract