If you need read-write access to the input value, do not add the readonly attribute. It is ignored if the value of the type attribute is hidden, range, color, checkbox, radio, file, or a button type (such as button or submit).
But of course there are dishes which can be considered as typical Australian food. People eat a lot of red meat, especially beef. And no wonder, as the beef in this country is among the best in the world. Lamb is also a favourite food and so is pork. Chicken and fish are very important in Australian diet.
He asked if it is a novelty or something that is eaten regularly like pork or beef. The answer you are looking for OP is novelty. Sure some of you posters here might have it weekly and never eat beef or pork. But OP is asking Australians in general. Kangaroo is a novelty in Australia for most of the population. Unlike beef, chicken, pork & lamb which are staples.