The ornamental design for a cookingcontainer, as shown and described.
FIG. 1 is a front perspective view of the cooking container;
FIG. 2 is a rear perspective view of the cooking container;
FIG. 3 is a front view of the cooking container;
FIG. 4 is a rear view of the cooking container;
FIG. 5 is a right side view of the cooking container;
FIG. 6 is a left side view of the cooking container;
FIG. 7 is a top view of the cooking container; and,
FIG. 8 is a bottom view of the cooking container.
The drawings include depictions of a cooking container having handles and hinges which are shown in phantom lines and do not form a part of the claimed design.