Nice! What’s the dark purple stuff?
That's a climbing French bean called "Cosse Violette." It is delicious, so much so one can eat them straight off the plant without cooking. Other plus points are because they're purple it's easy to see the beans when picking. When steaming they turn green - as soon as they go green they're ready to eat.
It's typical of what I grow. I only grow what is difficult to buy, expensive or better grown at home. Tomatoes for example are chilled by the grower before sending to the supermarket. The chilling breaks down the sugars which give the flavour. Commercially tomatoes are chilled to extend shelf life. My tomatoes taste like tomato!
Another example is black kale, Cavalo Nero. It's a doddle to grow but really expensive in the shops. Also freezes very well.