(450^) for two minutes. Stir in the batter, pour one fourth of it into the pan and bake it in the very hot oven for two minutes, or until it is set. Arrange the sausages on the batter, pour the remaing batter over them, and bake the mixture for 15 minutes. Reduce heat to moderate (375^) and bake the mixture for 10-15 minutes more, or until it is puffed and golden brown. Serve the dish immediately with Dijon-style mustard, if desired.