Super green soup with buttermilk and leek

There’s no fewer than eight (count ‘em!) vegetables in this light, super-nourishing soup, including broccoli, zucchini, spinach, peas and leeks. But would it be wrong to say, you can’t even pick them? They’re blended with stock into a uniformly smooth, sweet, vibrant puree, enlivened by the tang of buttermilk and a few subtle herbs and spices – a taste of the spring that’s on its way. Vegophiles, this one’s for you. And those with small vegophobes to feed – it's even more for them!