Heat the oil over a medium heat in a large, deep pot that has a lid. Cook the onion for 10 mins until softened and golden at the edges.

Crumble in the sausages, breaking them into bite-sized pieces using a spoon. Cook for 7-8 mins until golden and crisp. Stir in the garlic and chilli.

Add the broccoli and courgettes. Cook for 10-12 mins until soft, then pour in the pasta and chicken stock. Stir to combine, then bring to a boil. Reduce to a simmer, put the lid on and cook for 8-10 mins, until the pasta is almost cooked.

Wilt in the kale or cavolo nero in batches and cook for a further 2-3 mins, until the kale is cooked and the pasta is al dente. Squeeze in the lemon juice and season well. Divide between four bowls and sprinkle over the lemon zest and parmesan shavings to serve.