All the ingredients are simple. The process is slice and fry.

I think by most general definitions, this wouldn’t be ultra processed, but intuitively we look at a bag of potato chips as think “unhealthy / ultra processed” (correctly).

Coffee and tea is ultra processed by most definitions, but also not intuitively what I would call ultra processed.

I think that’s what makes these definitions difficult, and by extension doing research on such a topic.