The custard can be served straight away, or you can make it ahead, allow it to sit for a couple of hours before returning it to the ™ bowl to "whisk" it to a pouring consistency which it will retain for a little while. When placed in the fridge the custard will very slightly set due to the chilled environment, but again you can whisk it lightly in the ™ before serving to allow it to pour. If you wish the custard to have a slightly "caramel" flavour than use light muscovado sugar (or brown sugar) in place of the golden caster sugar. And if you wish to make a "Brandy Custard" then simply add 1 tablespoon (20ml) of brandy to the custard when you return it to the Thermomix to whisk it, taste, then add a little more if you prefer a stronger flavour.