In Australia, the doughnut is a popular snack food. Jam doughnuts are particularly popular and a unique aspect of Australian culture, especially in Melbourne, Victoria and the Queen Victoria Market, where they are a tradition. Jam doughnuts are similar to a Berliner, but are served hot: red jam (raspberry or strawberry) is injected into the bun before it is deep-fried, and then it is coated with either sugar or sugar mixed with cinnamon as soon as it has been cooked. Jam doughnuts are sometimes also bought frozen. In South Australia, they are known as Berliner or Kitchener and often served in cafes. Popular variants include custard-filled doughnuts, and more recently Nutella-filled doughnuts.