Cooking appliance with a filling opening for filling with cleaning liquid and method for filling a cooking device with cleaning fluid

The invention relates to a cooking appliance with filling opening (18) for cleaning liquid, a system comprising a container for cleaning fluid and cooking device and a method for filling a cooking device with cleaning fluid. The invention has the object of providing a cooking appliance having a filling opening (18) for cleaning fluid, to provide a system of a cooking appliance with a container for cleaning liquid as well as a method for filling a cooking device with cleaning fluid available which allow a clean and safe filling. A cooking appliance according to the invention has at least one filling opening (18) for filling with cleaning fluid via a first line in the Gargerateinnenraum or in a tank. The filling opening (18) is designed such that at least part of a container in the filling opening (18) is insertable, wherein in the filling opening (18) at least one piercing member (32) is arranged such that upon insertion of the at least one part of the container in the filling opening (18) arranged on the container closure member is pierced such that the cleaning liquid in the container flows immediately after penetration into the Gargerateinnenraum or in the tank.