Odd one out

[rebbonk]

An Irish man and an English man are applying for a job, the first part of the interviews goes OK.

So the personnel manager says "Right for the next we have a little test, out of these three items I want you to tell me which is the odd one out."

There is a cabbage, a potato, and a knife.

The Englishman says, "Well the cabbage and potato are vegetables, so it must be the knife is the odd one out."

The personnel guy says, "OK, thanks, now Patrick what is your view?"

Patrick looks and shakes his head, then says, "I disagree with that, I think it is the cabbage that is the odd one out,

Spoiler:

with the other two you can make chips"