Sunan at-Tirmithiy كتاب الصوم باب ما جاء ما يستحب عليه الإفطار
Salmān Ibn-Āmir ad-Dabbiy said that the Prophet, peace and blessings of God be upon him, said, "When one of you breaks his fast, he should do so with dates." Sufyān Ibn-Uyaynah (one of the narrators) added to this (the words of the Prophet, peace and blessings of God be upon him): "... for indeed, they (dried dates) are a blessing. And whoever does not have dried dates should break his fast with water for, indeed, it is pure." Click on ḥadīth to read more