Food Cooked in a Dairy/Meat Pot
If a non-dairy food, such as pasta, was cooked in a dairy pot, can it be eaten together with meat?
The Aish Rabbi Replies
If the pot was used for cooking dairy within 24 hours before you used it for the pasta, then it may not be eaten together with meat but can be served as a separate course, washing the hands before switching from the meat to the pasta.
If the pot was not used for dairy within those 24 hours (or you do not know that it was used that recently), then the pasta may even be eaten together with meat – although you may not cook it specifically to eat it with meat. All of the above assumes the pot was properly cleaned between uses.
The reason we are more lenient with this than cases of pots which had non-kosher cooked in them is because (a) the dairy taste is perfectly kosher, and (b) by the time it enters the walls of the pot and subsequently exits it, Jewish law considers it to be “weak”. Indirect kosher tastes are relatively insignificant in Jewish law. (See Talmud Hullin 111b).
(Sources: Rema to Shulchan Aruch Y.D. 95:2, Rema to Y.D. 89:3, Chochmat Adam 48:2.)