Place the eggs and water in a blender.  While running the blender, slowly add the flour.  Add the salt and milk and blend for 30 seconds more.
Let stand in a refrigerator for 1 hour or more.
Heat the roasting pan with beef drippings to 450F.  Pour in the pudding mixture.  Cook in a very hot oven for 20-25 minutes or until puffed up and golden brown.  Remove from the pan immediately and cut into slices.  Serve with brown gravy.