The ornamental design for a foodslicer, as shown and described above.
FIG. 1 is a top left front perspective view of a food slicer showing my new design;
FIG. 2 is a bottom right back perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a right side elevational view thereof; and,
FIG. 8 is a top left rear perspective exploded view thereof.
The broken line portions of the drawings show unclaimed subject matter and/or environment for illustrative purposes only and form no part of the claimed design.