I was thinking about zucchini, as I never peeled it. Super Baby Food says no peels or skins of fruits and veggies until age 3 b/c of choking hazard.
I only removed the skins from zucchini (& squash) in the early days. Once DD got better at eating, I left it on, but made sure to cook it well so it's soft. Doesn't seem to be a problem with her.
I like making mashed potatoes with the skin on, so I have to pick out the skins before giving it to DD. She can probably do it with skin, but I'd rather not take that chance right now.
I have that same site bookmarked. It is the only baby food site I bookmarked. I guess I thought it was so good, I didn't look further for others.