PROBLEM TO BE SOLVED: To provide a method of yeast fermentation for predicting application development of an agricultural processed product and an agricultural processing waste, for estimating usefulness, for example, a method capable of acquiring a metabolic product suitable for a food product or seasoning.SOLUTION: The method of yeast fermentation in the invention comprises: a step for preparing a culture fluid including saccharide and at least one of an agricultural processed product and an agricultural processing waste, in a condition in which, property of yeast fermentation cannot be exhibited, a step for inoculating yeast to the culture fluid, and a step for generating a metabolic product of the yeast in the culture fluid. The agricultural processing waste includes no roasted coffee lees.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】本発明は、農産加工品及び農産加工廃棄物の用途開発を予想し、有用性を推測する酵母発酵の方法、例えば食品、又は調味料に好適な代謝産物を得ることができる酵母発酵の方法を提供する。【解決手段】本発明に係る、酵母発酵の方法は、酵母発酵の特性を発現できない条件で、糖類と、農産加工品及び農産加工廃棄物のうち少なくとも一方とを含有する培養液を調製することと、前記培養液に酵母を接種することと、前記培養液中で、前記酵母の代謝産物を生成させることと、を含む。前記農産加工廃棄物は、焙煎コーヒー粕を除く。【選択図】なし