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.
Kaiser roll The Kaiser roll (German: "Kaisersemmel" ), also called a Vienna roll ("Wiener Kaisersemmel"; as made by hand also: "Handsemmel", Slovene: "kajzerca") or a hard roll, is a typically crusty round bread roll, originally from Austria. It is made from white flour, yeast, malt, water and salt, with the top side usually divided in a symmetric pattern of five segments, separated by curved superficial cuts radiating from the centre outwards or folded in a series of overlapping lobes resembling a crown. The crisp "Kaisersemmel" is a traditional Austrian food officially approved by the Federal Ministry of Agriculture.