"I entered the house of the Prophet with him and there was some bread and vinegar. The Messenger of Allah said: 'Eat; what a good condiment is vinegar.'"  

دَخَلْتُ مَعَ النَّبِيِّ ﷺ بَيْتَهُ فَإِذَا فِلَقٌ وَخَلٌّ فَقَالَ رَسُولُ اللَّهِ ﷺ كُلْ فَنِعْمَ الإِدَامُ الْخَلُّ