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Heat oven to 220C/200C fan/gas 7. Roast the pepper, carrots and onion in a deep baking dish for 15 mins. Add the sausages and roast for a further 10 mins.
Reduce oven to 200C/180C fan/gas 6, tip in the tomatoes and beans, then stir in the stock. Cook for another 35 mins. Stir in the mustard and peas and return to the oven for 5 mins. Rest for 10 mins, then serve with potatoes, pasta or rice.