Hisham bin Urwah narrated from his father that Sayyidah Aishah (may Allah be pleased with her) said: My mother wanted to make me put on weight before sending me to the Messenger of Allah (peace and blessings be upon him), but I would not accept anything she intended for me, until she fed me cucumber with fresh dates, and from that I put on weight very well.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14470