The present invention is directed to methods of generating Umami flavor in-situ in food and beverage compositions by treating food or beverage compositions with an enzyme composition having glutamate releasing activity. The glutamate residues, free form, or C or N terminal short peptides produce Umami taste enhancement in the treated food or beverage. The present invention is also directed to methods of generating Umami flavor in-situ in food and beverage compositions by treating food or beverage compositions with an enzyme composition having aspartate releasing activity. The aspartate residues, free form, or C or N terminal short peptides produce Umami taste enhancement in the treated food or beverage.