What is claimed is the ornamental design for a potato ricer, as shown and described.
FIG. 1 is an isometric view of the potato ricer;
FIG. 2 is a front view of the potato ricer;
FIG. 3 is a back view of the potato ricer;
FIG. 4 is a right-side view of the potato ricer;
FIG. 5 is a left-side view of the potato ricer;
FIG. 6 is a top view of the potato ricer; and,
FIG. 7 is a bottom view of the potato ricer.
The broken lines in the drawings, including but not limited to the grate illustrated in FIG. 7, represent portions of the potato ricer that form no part of the claimed design.