Hadith.4258 - Imam Jafar ibn Muhammad Al-Sadiq (as), said:
"Indeed, the Banu Umayyah begin their meals with vinegar and end them with salt. Whereas we begin our meals with salt and end them with vinegar."
Al-Kāfi #1324“Abu ‘Abd Allah (a.s.), has said, ‘We begin with vinegar which is with us as you begin with salt which is with you, and vinegar strengthens...