Mix hamburger, applesauce, salt, bread crumbs, eggs, chopped onion, and milk all together. Mix well.  Form into a loaf and put into pan.  Mix together ketchup, mustard, and brown sugarfor the topping.  Make an indentation on top and pour topping on.  Bake at 350 degrees for 50 to 60 minutes.  Makes 1 large or 2 small loaves. Very good!