The invention provides a food grater assembly comprising a base; an external cylindrical portion removably attached to the base; a grater disc disposed within and removably attached to the lower end of the outer cylindrical portion; an inner divider having a cross wall dividing the inner space of the inner cylindrical portion in two equal portions; said divider being able to rotate freely within the external cylindrical portion; a plunger disposed within the divider, said plunger having a plurality of annular ridges disposed along a portion of its length; said plunger portion having a closed bottom wall and a slot defined axially and longitudinally along a portion of is length; a pair of engaging strips flexibly attached to and disposed in the wall of the external cylinder, each of said engaging strips having horizontal ridges along a portion of the inner surface thereof for engaging and disengaging the horizontal ridges of the plunger; and a cap disposed on the upper end of the inner plunger portion.