Cyril P. Callister created what food spread from leftover brewers' yeast extract in 1922?
Cyril P. Callister: Cyril Percy Callister (16 February 1893 – 5 October 1949) was an Australian chemist and food technologist who developed the Vegemite yeast spread. Vegemite: Vegemite ( ) is a thick, black Australian food spread made from leftover brewers' yeast extract with various vegetable and spice additives.
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