Reference for Avodah Zarah 70:5

והיינו דתנן א"ר יהושע שמעתי בפירוש שהמעמיד בשרף העלין ובשרף העיקרין מותר בשרף הפגין אסור מפני שהוא פירי

and this is what we learned: R. Joshua said: I have heard explicitly that milk curdled with the sap of the leaves or with the sap of the root is permitted; but if with the sap of unripe figs it is forbidden, because this is a fruit.

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