Five things restore one’s learning if one has forgotten it: bread roasted on coals, and certainly the coals themselves, a soft-boiled egg without salt, the regular use of olive oil and wine and spices, and the drinking of water which remains from kneading. Others say: dipping one’s finger in salt and eating this is also included.

Preuss, Julius. Biblical and Talmudic Medicine (p. 561). Jason Aronson, Inc.. Kindle Edition.