Steam cooking method for operating a steam cooking oven (1) comprising at least the following steps:- placing vacuum packed food stuff (2) in an oven cavity (5)；- a heating step comprising heating up the oven cavity (5) until the oven cavity centre has reached a defined temperature (Td) by operating a steam generator (3) and supplying steam generated by the steam generator (3) into said oven cavity (5), wherein a convection fan (4) is operated within the oven cavity (5)；- a maintaining step comprising maintaining said oven cavity (5) at said defined temperature (Td) of the oven cavity centre by operating said steam generator (3) and supplying steam generated by the steam generator (3) into said oven cavity (5) over a certain period of time while said defined temperature (Td) of the oven cavity centre is not allowed to vary about more than +/-1,5°C；- wherein at least during said heating step and said maintaining step the actual temperature (Ta) of the oven cavity centre is determined by a control unit of the steam cooking oven (2) by means of an algorithm that is based on the temperature values measured by a temperature sensor within the oven cavity (5) and wherein said actual temperature (Ta) is used to operate the steam generator such, that said defined temperature ((Td) of the oven cavity centre is reached or maintained.
