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Heat the oil in a saucepan over a medium heat and tip in the carrot, spring onions, garlic, mushrooms, oregano and fennel, along with a pinch of salt. Cook for about 5 mins.
Add the sausagemeat and cook until browned all over, then add the chopped tomatoes and ketchup, along with a pinch of salt and 100ml water. Reduce the heat to low, cover and cook until the sauce is thick, about 20 mins, stirring now and again. Season to taste, then serve with buttery mashed potato, pasta or couscous.