Sayyiduna Ali (may Allah be pleased with him) narrates: On the day of Eid al-Fitr, the Prophet (peace and blessings be upon him) used to eat something before going to the Eid prayer ground.
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains Sawwar bin Mus'ab, who is extremely da'if (weak).