《太平广记·卷十四·神仙十四》
井里到处都是黑泥一样的东西，但气味很芬芳，吃了以后就一点也不饿了。
井中物如青泥而香美，食之了不饥。
There were black, muddy things everywhere in the well, but the smell was very fragrant. After eating it, the old man was not hungry at all.