FIG. 1 is a side view of the spice grinder; FIG. 2 is a side view of the spice grinder; FIG. 3 is a top view of the spice grinder; FIG. 4 is a bottom view of the spice grinder; FIG. 5 is a top perspective view of the spice grinder; and, FIG. 6 is a bottom perspective view of the spice grinder. The broken lines are for illustrative purposes only and form no part of the claimed design.