Patent No. 598981 Disclosed is a process to produce a vegetable flavour comprising a) preparing a composition comprising a vegetable, an oil and a yeast extract and/or yeast autolysate, b) intimately mixing the composition in an extruder at a temperature between 100ºC and 160ºC and a reaction time between 1 second and 1 week, sufficient for the concentrated vegetable flavour to develop.