In a large bowl, lightly beat eggs. Combine milk and butter; add to eggs along with sugar, salt, spices and vanilla. Add bread cubes and, if desired, raisins; stir gently. , Pour into a well-greased 11x7-in. baking dish. Bake at 350° until a knife inserted 1 in. from edge comes out clean, 40-45 minutes. , Meanwhile, for sauce, combine the sugar, cornstarch and salt in a saucepan. Stir in water until smooth. Bring to a boil over medium heat; cook and stir until thickened, about 2 minutes. Remove from the heat. Stir in the butter, vanilla and nutmeg. Serve with warm pudding.