I asked al-Hasan about what is cooked from grape juice. He said, "Cook it until two-thirds evaporate and one-third remains."
أخبرنا سويد قال أنبأنا عبد الله
سألت الحسن عما يطبخ من العصير قال ما تطبخه حتى يذهب الثلثان ويبقى الثلث
No references are available.
[Its chain is hasan] Nasai is the only one who narrated it.