Add all the vegetables to a large tray and bake at 200C for 25-30 mins, until soft but not browned. The vegetables should be soft enough for a fork to glide through easily.
Transfer to a blender (I use @magimixuk) with vegetable stock and blend until you reach a gorgeous velvety consistency, like you see in the video.
Serve with garlicky sourdough bread or like I did with crunchy chickpeas on top.