Must post a retraction--
DH says I got the explanation wrong about the peanut oil. He says there is controversy over whether peanuts are or aren't kitniyos. Therefore, peanut OIL, which is a step removed from peanuts, which might or might not be kitniyos in the first place, is permissible. This provides me no insight whatsoever into why those Passover marshmallows have corn syrup in them, though. Also makes me a little less sanguine about being told that soy sauce or TVP is o.k. Ah, well...
I could try asking my OWN rabbi, I suppose...reform rabbis are actually excellent at helping you understand the WHYs of things, so that you can figure out the principle behind them and apply as you see fit.



I was actually going to ask you if the marshmallows actually said "corn syrup and/or something else", as I believe Coca-Cola does. But I looked back at your post and saw that you mentioned a whole explanation from a rabbi on it, so I'm just as stumped as you are. Perhaps more observant Jews won't eat it? I have an uncle that won't eat items observed by certain Rabbis because he doesn't like their views, despite the Rabbi being 'ultra-Orthodox' (my uncle is Frum).