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To begin, add the borlotti beans to a large pan with the shallot, garlic, carrot, celery and thyme, then cover with cold water. Bring to the boil then turn down the heat and simmer for 1 hour. Once the borlotti beans are ready, remove the pieces of shallot, celery and carrot and add the 'Nduja. Stir through until the mix has a soup-like consistency. Keep warm until ready to serve