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Heat the oil in a large pan, add the sausages and fry until browned. Add the onions and pepper, and fry for 5 mins until softened. Add the tomatoes and 1 can of water, the Worcestershire sauce, mustard and sugar. Season and bring to the boil. Give it a stir, then reduce the heat, cover and simmer for 15 mins.
Stir in the beans, return to a simmer and cook for a further 5 mins. Scatter with parsley or coriander and serve in bowls with tortillas.
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