I’m confused. Other replies seem to indicate (corn based) vinegar is kosher for all. For example 1) here , 2) here and 3) here .
My understanding was that Rabbi Abadi’s shita was that, since corn-based vinegar is just a derivative of corn, and not corn itself, any corn-based vinegar was OK for even for Ashkenazim who didn’t eat actual corn on Pesach. Please clarify. Thank you.