Zuppa di ribollita (zuchini kål cannelini)

2 tbsp cold-pressed olive oil, plus extra for serving 1 onion, chopped
4 garlic cloves, finely chopped
2 carrots, diced
a pinch of dried chilli flakes
10 sage leaves
a handful flat leaf parsley, leaves picked 1 tomato, diced
1 courgette (zucchini), halved lengthwise and sliced
300 g (101⁄2 oz) cavolo nero green kale or Savoy cabbage
100 g (3/1⁄2 oz/1⁄2 cup) dried cannellini beans, soaked and cooked (or a 400g/14 oz can, drained)
about 1 litre (34 fl oz/4 cups) vegetable stock or water
sea salt and freshly ground pepper, to taste

To Serve
4 slices wholegrain sourdough bread, cubed or torn in pieces
a piece of Parmesan cheese, shaved

Heat the oil in a saucepan. Add the onion, garlic, carrots, chilli and sage and cook over a low heat for 20 minutes until softened but not browned. Add the parsley, tomato and courgette and cook for a couple of minutes. Add the cavolo nero and beans and cover with stock or water. Bring to the boil, reduce the heat and simmer for 30 minutes. Season to taste. The soup should be the consistency of a thick stew with a little broth. Serve in bowls and arrange bread cubes, shaved Parmesan cheese and a drizzle of olive oil over each.