Does cooking kitniyot in a pot render it non-kosher-for-Passover for Ashkenazic Jews? If so, why?

Question

I've heard of cases where a Sephardic family, for whom rice is totally kosher for Passover (assuming it's checked and contains no additives etc.), cooked rice in a pot. The next day, they invite their Ashkenazic neighbors over and cook completely kitniyot-free, but their Ashkenazic neighbors say it's a problem as even potatoes cooked in that "kitniyot" pot is a problem.

Am I getting this correct so far?

If so, is there any halachic basis to this, or is it "just one of those Passover customs"?

This should, in theory, be far better than a case of a non-kosher pot; by some quick back-of-envelope math, for any normal pot I can think of, the ratio of volume-of-the-pot-material-itself against volume-contained-within-the-pot should be far less than 50%.

Answer 1

Those that cited OC 453 are correct: the Mishna Berura in Se'if Katan 8 states clearly that if rice was found in soup, just throw out the rice, and you may eat the soup. The same applies for a pot that was used to cook kitnios for a child that must have kitnios on Pesach. Whether lechatchila you may use the pot is debatable. The Feinsteins hold that one should not use the pot lechatchila, but if it has been used, one may eat the food lechatchila.

I would hesitate to cite Sfardic poskim on this issue. Some denigrate the Ashkenazic minhag of kitniyos and therefore rely on mattirim that we would not necessarily consider.

Answer 2

hazon ovadia pesah page פו an ashkenazi can eat at a sepharadi even if he cooked rice on the pot see there if you want more mecorot of understand the mahloket

on the other hand I heard from a friend that the rabanim ashkenazim are mahmir on this, but I don't have any source

Answer 3

Kitniyot is not chametz - Keilim used for Kitniyot are not assur for Ashkenazim - In fact I recall one major Rishon (I have to find the citation) who wrote that if an Ashkenazi is served a soup on Pesach that has rice in it, he merely needs to remove the rice and can eat the rest of the soup.

There is no requirement to sell Kitniyot for Pesach or Keilim used for Kitniyot (in fact - someone who sold their kitniyot might be violating the issur of Bal Tosif).

See also הלכות כשרות לפסח. Section Nun-Vav which cites the Shulchan Aruch 453:1

As the person who is preparing the food (the sephardi) has no issur of kitniyot, then any miniscule kitniyot residue is still considered a permitted item for him, so all rules of batel b'rov would still apply to him.

Answer 4

I would say it has to do with Chometz is Assur B'Mashehu. Since we are very Makpid on Pesach therefore we do not do so.

I come from a family that does not eat Gebruks, however my wife's family does. The first Pesach I went to my in laws I asked Rabbi Hillel David how to deal with it. He said that on dishes they used, so long it is washed well I can use it too. However for pots and pans the ones that had Gebruks made in them I should not use over Pesach.