Remove the sausages from its casings and break into pieces.
Put the sausage into a cold frying pan and turn on to medium heat. This was the sausage will render its fat which is used for frying.
Add the shallots
Once the shallots have softened, add the cannellini beans and rosemary. Mix well.
Finish with the sherry vinegar.
Add salt and pepper to taste if needed.