The present invention relates to a process to produce a food or feed flavour. The invention also relates to a food or feed flavour obtainable by the process of the invention and the use thereof. The process of the invention comprises preparing a composition comprising a cystein and/or glutathione, incubating the composition under conditions of temperature and reaction time sufficient for the feed or food flavour to develop, and optionally mixing the food or feed flavour with one or more other ingredients. With this process many different food or feed flavour can be produced.
