A completely disposable cooking apparatus used for filling and decorating of foods, that is a one-piece disposable construction, comprising a one-piece, funnel-shaped bag with a soft side wall, having an open first end at the “top” or wider end of the funnel through which food material can be inserted into the bag and a closed second end at the “bottom” or narrow end of the funnel, with an integral, malleable, conical shaped, discharge orifice (also sometimes referred to as a nozzle or a tip). The orifice has serrations or ridges extending inwardly from the internal wall of the orifice, running longitudinally or parallel to the cone axis for all or a part of the length of the orifice. The orifice can either be initially closed or manufactured with a small opening or hole. The orifice is made of a material so that it is capable of being cut at any point along its longitudinal axis to yield an exit opening or hole with a desired size. Regardless of the point of cut, i.e., regardless of the size of the hole or opening, the inwardly extending serrations or ridges that remain after the cut insure that the material is “treated” as it is expelled from the bag through the orifice. While the orifice is capable of “treating” the material as it is discharged from the bag, the orifice is also either: (a) elastic or flexible enough in order to allow the hole or opening in the orifice to expand to pass “clogs” or “lumps” and then return to its original shape; or (b) supple or deformable enough in order to allow the orifice to be compressed or collapsed “upstream” of the hole or opening so that the “clogs” or “lumps” can be broken up and then passed through the hole or opening when the orifice returns to its original shape.