Step 1

Refreeze 1 pastry half, as it's not required. Place the 3 remaining halves on a lined baking tray, prick all over with a fork then refrigerate for 1 hour.

Step 2

To make creme, place egg yolks, flour and 2 tablespoons of the sugar in a bowl and whisk until pale. Combine milk, remaining sugar and split vanilla bean in a saucepan and bring to the boil over medium heat. Strain into egg mixture and discard vanilla bean. Return to pan and cook over low heat, stirring for 2-3 minutes or until thickened, then cool.

Step 3

Preheat oven to 190°C. Bake pastry for 10 minutes, then place a sheet of baking paper and a baking tray on top of pastry and return to oven for 10 minutes. Remove paper and tray and cook for a further 5 minutes, then allow to cool.

Step 4

Place dark chocolate in a heatproof bowl over a saucepan of simmering water (don't let the bowl touch the water). Once the chocolate has melted, stir until smooth. Cool completely.

Step 5

Spread chocolate over one pastry half. Combine whipped cream and creme patisserie. Place an unglazed pastry half on a serving tray and spread with half the cream. Top with other piece of unglazed pastry and remaining filling. Top with glazed pastry. Place white chocolate in a piping bag and pipe thin lines across the top. Use a skewer to drag the lines. Refrigerate for 30 minutes before serving.