I have a fairly small veg plot in the garden and this year I'm doing ordinary veg but have realised that much of the veg I grow, while staples are easily bought quite cheaply in supermarkets. The exception to this, in my garden, are salad leaves, sprouting broccoli and asparagus which are expensive in the shops but cheap and easy to grow.
I'd like to fill my plot with this sort of stuff. Salsify was mentioned on another thread so I think I'm going to give that a go, and I want to grow globe artichokes too.
Can anyone recommend other veg that are either expensive in shops, or can't be found in shops that you grow and wouldn't be without?