I claim the ornamental design of a cooking vessel, as shown and described.
FIG. 1 is a perspective view of the cooking vessel showing my new design.
FIG. 2 is a top plan view of the cooking vessel showing my new design.
FIG. 3 is a bottom plan view showing the cooking vessel of my new design.
FIG. 4 is a first, side elevation view of my cooking vessel showing my new design.
FIG. 5 is a second side elevation view of the cooking vessel showing my new design, and which is taken from a position 180 degrees offset from that seen in FIG. 4.
FIG. 6 is another, side elevation view of the cooking vessel showing my new design, and which is taken from a position 90 degrees offset from that seen in FIG. 4; and,
FIG. 7 is still another, side elevation view of the cooking vessel showing my new design, and which is taken from a position 180 degrees offset from that seen in FIG. 6.