The ornamental design for a utensil accessory, as shown and described.
FIG. 1 is a perspective view of the utensil accessory;
FIG. 2 is another perspective view of the utensil accessory corresponding to FIG. 1 as the utensil accessory may be used with a utensil such as a spoon, wherein the spoon is exemplary of the use environment and does not form part of the design and therefore is shown in phantom;
FIG. 3 is another perspective view of the utensil accessory corresponding to FIG. 1 as the utensil accessory may be used with a utensil such as a nail clipper, wherein the nail clipper is exemplary of the use environment and does not form part of the design and therefore is shown in phantom;
FIG. 4 is a front view corresponding to FIG. 1;
FIG. 5 is a rear view corresponding to FIG. 1;
FIG. 6 is a right side view corresponding to FIG. 1, with the left side view being a mirror image thereof;
FIG. 7 is a top plan view corresponding to FIG. 1; and,
FIG. 8 is a bottom plan view corresponding to FIG. 1.