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Gently cook the shallots, parsley stalks, garlic and chorizo in the oil in a large pan with a lid or casserole dish until the shallots are softened – about 5 mins. Add the cavolo nero and cook for a couple more mins, then add the wine and cook for another 1 min.
Stir in the beans, then add the mussels, ensuring they’re well coated with the sauce, and cover with the lid. Cook for a few mins, shaking the pan to release the mussel juices, until they’ve all opened (discard any that haven’t). Scatter over the parsley leaves and squeeze over the lemon to serve.