This is a little different than the usual tomato type meatloaf glaze. I found the recipe in a cookbook I picked up at a garage sale called "Like Grandma Used To Make" and I tweaked it a little bit. I usually double the sauce.
Preheat the oven to 350*F. Mix the ground beef, crackers, milk, onion, mushrooms or green pepper, parsley, salt, sage, black pepper and eggs. Shape the mixture into an 8x4 inch loaf and place in a shallow baking pan. (I have one of those 2 piece meatloaf pans where the grease drips to the bottom and I love it!).
Bake for approximately 1 hour or until the internal temperature reaches 170*F.
In a small bowl, combine the brown sugar, lemon juice and mustard. Spread over the meatloaf and return to the oven for 10 minutes.