Nearly every culture known to mankind has rituals paying respect to the dead. Many of these rituals revolve around food—the idea that the dearly departed need to be satiated in their journey to the afterlife.
Buddhists leave fresh fruit and vegetables on altars. The Celtics leave a seat at the table for the departed during Samhain, the Gaelic festival/feast marking the end of harvest season. Americans may be familiar with "pouring one out"—typically something alcoholic—for a fallen friend.