Millionaire's Chocolate Tart

Pastry

• 150 g plain flour, plus extra for dusting
• 35 g icing sugar
• 100 g unsalted butter, cold, diced
• 1 egg yolk, from medium egg

Filling

• 100 g dark chocolate, small pieces or callets
• 2 medium eggs
• 3 egg yolks, from medium eggs
• 45 g golden caster sugar
• 250 g caramel sauce (tinned)
• 75 g white chocolate, small pieces or callets