In Australia in 1923, World War I had ended five years earlier, Billy Hughes was replaced as prime minister by Stanley Bruce, and Australians were getting their first taste of broadcast radio.
It was the year industrial chemist and food technologist Cyril Percy Callister was commissioned to create a yeast-extract spread to rival British-made Marmite.
After trialling the production of a rich and salty spread from brewer's yeast crafted through a complicated preservation process, Dr Callister introduced the thick inky spread known as Vegemite to Australian audiences.
