This is a classic Provençal vegetable soup, which we’ve given a rich, earthy walnut pesto twist. Perfect for warming up those cold winter nights.
In a large saucepan, heat the olive oil and add the onion, carrot, celery and fennel. Cook for 5-6 minutes over a low heat until starting to soften. Add the garlic and basil stalks and cook for 2 more minutes. Add the tomatoes, spinach, cannellini beans and when the spinach has wilted, season with salt and pepper and add the stock. Mix well and bring to a simmer, cook for 10 minutes.
While the soup is cooking, prepare the pesto. Put the walnuts, basil, Parmesan and garlic into a food processor and whizz for 10 seconds or until nearly smooth. Add the salt and whizz again, gradually drizzling in the oil until it is all combined. Season to taste.
Once the soup is done, ladle into 6 bowls and drizzle the pesto on top of each one.
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