A. Yes, you might have noticed we’re doing a lot of Passover dishes with onions, beets, carrots, sweet potato and especially potato. Potato is the big-time vegetable for Ashkenasic Jews who can’t eat rice, corn or beans on Passover.
But in addition to that, there’s a Chabad custom (some others do this too) to only eat peeled vegetables on Pesach, which kind of narrows things down to the easily peelable root vegetables. Yes, we peel cucumbers and even firm tomatoes, but its much more complicated to peel a pepper or strawberry.
Now, this isn’t official or anything, and it doesn’t say this explanation in any books – but think about it: Passover celebrates our roots as a people.