The ornamental design for cookware, as shown and described.
FIG. 1 is a perspective view of a cookware in an open configuration according to the new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is bottom plan view thereof;
FIG. 4 is a right side view the cookware in a closed configuration, of which the left side view is a mirror image;
FIG. 5 is an enlarged top plan view thereof, of which the bottom view is identical thereto;
FIG. 6 is an enlarged front view thereof;
FIG. 7 is an enlarged rear view thereof; and,
FIG. 8 is an enlarged left side view of the cookware in an open configuration, of which the right side view is a mirror image.
The surface ornamentation, which are the portions as shown in broken line, are shown for the purpose of illustrating environmental structure, and forms no part of the claimed design.