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Put the porcini in a heatproof jug and cover with 400ml boiling water from the kettle. Leave to soak.
Heat the oil and butter in a large, deep frying pan over a medium heat and fry the shallots for 5 mins until soft. Add the chestnut mushrooms, turn up the heat to medium-high and fry for 5-10 mins until lightly golden. Add the garlic and wild mushrooms and fry for another 5 mins, then stir in the tomato purée and stir in the flour and paprika for 30 seconds until all the flour has been absorbed.
Pour the brandy into the pan and simmer for 5 mins until almost cooked off, then add the rehydrated porcini and mushroom stock, leaving any the last bits of gritty stock at the bottom of the jug. Bring to a bubble, then stir in the soured cream and mustard. Season and simmer for 5-10 mins until reduced enough to coat the mushrooms. Serve with mini roast potatoes.