Hazrat Umme Munzir radiyallahu anha says, Rasoolullah sallallahu alaihe wasallam visited me. Hazrat Ali radiyallahu anhu was with him. We had some bunches of dates hanging. Rasoolullah sallallahu alaihe wasallam began eating from them. Hazrat Ali radiyallahu anhu also began eating with him. Rasoolullah sallallahu alaihe wasallam stopped him saying, "You have just recovered from your illness and should not eat this." He (Ali radiyallahu anhu) stopped and Rasoolullah sallallahu alaihe wasallam continued eating. Hazrat Umme Munzir radiyallahu anha says, I then cooked some barley and beetroot. Rasoolullah sallallahu alaihe wasallam said to Hazrat Ali radiyallahu anhu, "Eat this, it is suitable for you."
English reference: Book 25, Hadith 172
Arabic reference: Book 26, Hadith 181