 Popular variants include custard-filled doughnuts, and more recently Nutella-filled doughnuts.Mobile vans that serve doughnuts, traditional or jam, are often seen at spectator events, markets, carnivals and fetes, and by the roadside near high-traffic areas like airports and the carparks of large shopping centres.Traditional cinnamon doughnuts are readily available in Australia from specialised retailers and convenience stores.