I was frying onions in a clean aino ben yomo meaty pan, and after about five minutes I took out a knife to stir them, as some were starting to burn. I took it out of the drawer and checked to make sure it was clean. After stirring i realized that I used a milky knife. What needs to be kashered? Is everything assur because of davar charif?
The knife, provided it is actually milky (it was used for hot milky dishes), requires hag’alah. The onions themselves (if the knife was not ben yomo), and certainly the pan, remain kosher (meaty).
Sources: After five minutes of frying, the strength of the onions is neutralized, and they no longer have the status of charif. Therefore, the milky knife, which came into contact with meaty onions (although it is not clear that onions are charif concerning eino ben yomo, this is not a case of hefsed in which one may sometimes be lenient), requires hag’alah. However, assuming that the knife was not ben yomo, after five minutes of frying the onions are not sharp enough to mend the taste in the knife, and the onions would therefore remain unaffected. This would apply to the pot even if the knife is ben yomo.
See (concerning onions after their cooking): Nachalas Shiva (61); Perim Megadim 108:9 and 96:1 (M.Z.); Yad Elimelech 94; Be’er Yaakov 103; some write that the halachah depends on our noticing that the sharpness has been weakened, but this is a safe assumption for onions after five minutes of frying. There is also a general safek about whether of not onions have the strength to mend the taste of eino ben yomo, and one may be lenient where there is an additional tziruf.Mi