not taking a stand, just passing along something I read -- I haven't vetted the references but the writer is someone I know and he's pretty smart.
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Chaim Steinmetz
repost, re: Kitniyot.
basically - my philosophy is this: 1. Kitniyot are a rather unusual custom, which was in dispute from the very outset. 2. kitniyot became far more significant an issue when it got entangled in the polemics of the early reform movement. 3. since kitniyot is a custom, and since avoiding more and more foods have the negative effect of reducing our enjoyment of pesach, lenient views on kitniyot should be adopted. 4. as such, the following is accepted: ingredients that are merely derived from kitniyot, such as aspartame (diet coke) and oils made from kitniyot - based on the views of rabbi isaac elchanan spector and rav kook 5. items that did not exist in 12th century Europe cannot be included in the custom, such as peanuts and quinoa - even perhaps soybeans (certainly soybean oil) . (corn is considered to be an exception to this, perhaps because cornflour is so similar to flour) -based on view of rav moshe feinstein. 6. eating non-kitniyot food cooked at a home of a sephardi (or sephardi restaurant), even if they cooked and served your (non-kitniyot) meal in pots and utensils that were used in the last 24 hours for kitniyot - based on rav ovadiah yoseph.7. I'd also allow bean corn and rice crackers baked according to the 18 minute regimen of "matza", as that is mentioned by many authorities as acceptable, but i know of no such thing being commercially produced nowadays. 8. commercial items produced in israel where a small amount of kitniyot is mixed into the larger mixture of food. - based on r. yitzchak elchanan above, and adopted by many in israel including r. nachum rabinovitch. 9. for those who are used to eating green beans in their stalks, because they are more vegetable than bean, one can rely on the view of the beit david cited by rav felder, and a similar opinion is cited by Rav Knoll in this article.