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Heat the rest of the oil in the pan over a medium-high heat and fry the mushrooms for 5-7 mins until they have released most of their liquid. Stir in the veg and garlic, and fry for 5 mins. Add the rehydrated porcini, the tomatoes, herbs, wine and sugar, bring to a simmer and cook for 10 mins. Add the sausages, cover, reduce the heat and cook for 1 hr.