I could sohappily live without broccoli, in my opinion an overrated vegetable which seems to have taken over from the much more delicately flavoured humble cauliflower! So, caulis I think and good old carrots!
I was just preparing some veg and decided that I could not live without onions. Their flavour and variety enhance most savoury food. Also, they become sweet when caramelised. I wondered what veg other GNs couldn't live without?