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Barbecue the sausages for 10-15 mins, turning occasionally, until cooked through. Meanwhile cook the tomatoes, cut side up, for 3-4 mins, until the skins start to blacken. Transfer to a bowl.
Mash the tomatoes with a fork and stir in the remaining ingredients. Spoon some into a long roll, add salad leaves, a sausage and top with a dollop of soured cream.