Preheat a fan forced oven to 180°C.

Grease an 18cm wide, 6cm high ovenproof baking dish with butter. Set aside.

Cut the hot cross buns in half and spread generously with Quince Paste and butter. Place the buns back together and arrange them in a prepared baking dish. Set aside.

To make the custard, place the eggs, caster sugar, cinnamon, milk, thickened cream and vanilla extract into a large mixing bowl and whisk together until well combined.

Pour mixture over the hot cross buns and allow to stand for five minutes to allow the custard to be soaked up by the buns. Gently push down on the buns if they happen to slightly float, then sprinkle with demerara sugar.

Place into the preheated oven and bake for thirty minutes or until set. Remove from the oven and serve immediately with crème fraiche.