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When the beef is ready, carefully remove all the foil from the roasting tray. Place a colander over a large bowl and tip in the filling. Let the mixture strain for a couple of minutes, then place the contents of the colander back into the tray and spread around to cool down. Transfer the strained liquid from the bowl to a large saucepan, bring to a simmer over a medium heat and cook until thick enough to coat the back of a spoon. Season with the pepper and the remaining salt, adding a little at a time, stirring and tasting until it has the correct level of seasoning. Pour the reduced liquid over the mixture in the tray and set aside to cool to room temperature, stirring occasionally to speed up the process. Once the mixture is cool, transfer the filling to the pie dish and level the surface. Nudge the nuggets of Stilton into the filling, distributing them evenly across the surface but avoiding the sides