“From Anas in marfoo’ form, ‘He used to open his fast with fresh dates before he would pray and if there were no fresh dates then he would open it with dry dates and if there were none then he would take a few sips of water.’
The Imaam said, ‘The purpose of me mentioning this hadith whilst being brief in a discussion of its chain of narration is only to remind people of this Sunnah which most of those who fast have neglected, especially during common invitations in which all manner of delicious and pleasant food and drink is prepared, but as for fresh dates or at the very least dry dates then they have no mention, and even worse than that is their neglect of breaking the fast with some sips of water—so glad tidings for whoever is from those, ‘who listen to speech and follow the best of it. Those are the ones Allaah has guided, and those are people of understanding.”” [Az-Zumar 39:18]
As-Saheehah, vol. 6/2/821.