Hazrat Umme Haani radiyallahu anha (a cousin of Sayyidina Rasoolullah sallallahu alaihe wasallam) says, Rasoolullah sallallahu alaihe wasallam came to me (to my house at the time when Makkah was conquered) and asked if there was something to eat. I replied, "Nothing besides dry bread and vinegar." Rasoolullah sallallahu alaihe wasallam said, "Bring it. That house is not without a curry which has vinegar in it."
English reference: Book 25, Hadith 164
Arabic reference: Book 26, Hadith 173