The key to this dish is making the batter carefully so that it rises nicely. Beat the eggs, then, whisk in the flour a little at a time, mixing well. Gradually add in the milk, making a smooth batter. Rest it for 1-2 hours. Preheat the oven and roasting tin. Fry the sausages in dripping or oil until browned. Transfer to the hot roasting tin, heat through, pour in the batter mix and bake for 25 minutes until risen. Serve.