The ornamental design for cooking utensil, as shown and described.
FIG. 1 is a top, perspective view of cooking utensil showing the cooking utensil of the present design in a closed mode, the broken lining on the top surface of the cooking utensil not being a part of the claimed design;
FIG. 2 is a front side view showing the handle of the cooking utensil of FIG. 1;
FIG. 3 is a left side view of the cooking utensil of FIG. 1, the right side being a mirror image;
FIG. 4 is a rear side view of the cooking utensil of FIG. 1;
FIG. 5 is a bottom side view of the cooking utensil of FIG. 1, the broken lining on the bottom surface of the cooking utensil not being a part of the claimed design;
FIG. 6 is a top perspective view of the cooking utensil of FIG. 1 showing the cooking utensil in an open mode and inner surfaces of the cooking utensil; and,
FIG. 7 is a top perspective view of the cooking utensil of FIG. 1 showing the cooking utensil of FIG. 1 showing the cooking utensil in the open mode with the top surface and the bottom surface shown in a detached mode.