The ornamental design for a food preparation grater with push-up insert therefor, as shown and described.
FIG. 1 is a top, front perspective view of a food preparation grater with push-up insert therefor showing my new design, the rear perspective view being a mirror image;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a perspective view of the push-up insert thereof shown separately for clarity of illustration, the rear perspective view being a mirror image.