Palm Sunday is a significant date in the Lent period of the Christian calendar. Lent overall carries some pretty specific food restrictions of its own. The most famous one that many worshippers abide by to this day is that on Ash Wednesday, Good Friday, and all other Fridays during Lent, people over the age of 14 abstain from eating meat (aside from fish). The foods that are allowed on Fridays during Lent include eggs, milk, grains, fruits, and vegetables.

Source: https://www.distractify.com/p/palm-sunday-foods