Lembas is a type of waybread made by the elves of Lothlórien. It is known for being extraordinarily sustaining, being able to keep a strong man on his feet for a day with just one bite, and quite tasty. It also keeps very well, especially when stored in its mallorn leaf–wrapping. All of this makes it very handy for nutrition-deprived agents on the job, when they can snag a piece. As Merry and Pippin found out in the movies, it is not advisable to eat a whole lembas cake. Let alone several.