The Prophet ﷺ used to eat cucumber with fresh dates.
حدثنا حفص بن عمر النمري حدثنا إبراهيم بن سعد عن أبيه
أن النبي ﷺ كان يأكل القثاء بالرطب
No references are available.
Bukhari also narrated it in the Book of Foods, Chapter on Cucumbers, no. 5447, and Muslim in the Book of Drinks, Chapter on Eating Cucumbers with Fresh Dates, no. 2043, from the hadith of Ibrahim bin Saad, with the same chain.