The invention refers to a cooking device (1) comprising a first interior chamber (2), a second interior chamber (3) being fluidly connected with the first interior chamber (2) via a drain (4) and comprising a first water reservoir (5), the drain (4) and the first water reservoir (5) forming a first air trap (6), and a device outlet (7) downstream of the second interior chamber (3), whereby said air trap (6) is adapted to be opened or closed by lowering or lifting the first water reservoir (5) between the first interior chamber (2) and the second interior chamber (3).
