*** Place the ramekins in a tray with hot water about 1/3 high. (See below). This will ensure an even cook, and cover the pan with foil.
Place in the oven, after 15 minutes, check if it's done. If the surface of the custard 'wobbles' too much when you move the dish, leave for a further 5 minutes.
When done, leave to cool and sprinkle with brown sugar. Refrigerate if not serving immediately.