The ornamental design for a pepper/salt grinder, as shown and described.
FIG. 1 is a front elevational view of a pepper/salt grinder of the present invention, where the rear elevational view, the right side elevational view, and the left side elevational view are mirror images of the front elevational view shown;
FIG. 2 is a front perspective view of the pepper/salt grinder of FIG. 1;
FIG. 3 is a top plan view of the pepper/salt grinder of FIG. 1; and,
FIG. 4 is a bottom plan view of the pepper/salt grinder of FIG. 1.