Sahl bin Sa`d (May Allah be pleased with him) reported:
There was a woman among us who would put beet root in a pot and add to it some ground barley. She used to cook them together. On returning from the Friday prayer, we would greet her and she would offer it to us.[Al-Bukhari].
App reference: Book 6, Hadith 19
Arabic/English book reference: Book 6, Hadith 863