Many years ago my daughters lived in Palmers Green and I would often pop down at a weekend for a bit of a culture change. The local railway station car park hosted a monthly Sunday Farmers Market and one of the market traders came up from the Isle of Wight with his tomatoes - Santa variety best tomatoes I have tasted.
It's a vegetable botanically but is actually a starchy tuber, and for dietary purposes is classed as a starchy carbohydrate like rice, pasta, bread etc.
I'm gonna go for samphire cos no ones mentioned it and I'll feel cultured, and you get to paddle in the sea off Norfolk if you want the proper stuff. It's probably classed as a plant tho.
I'll go sprout, full of flavour with plenty of bite. Also love swede/turnip mashed with plenty of butter. I do like all vegetables though, have plenty of meat free days.
Wonderful stuff is samphire. Just not that readily available. I believe there are places near Skegness where you can forage for it. Although that does of course involve going to Skegness, which is not for the faint hearted!
Unfortunately neither Veg, tomato has seeds so is a fruit but then so does a squash, potato is a tuber