Prepare glaze in small bowl. Combine tomato sauce, brown sugar and mustard; set aside.
Prepare Loaf
In large mixing bowl, combine eggs, onion, cracker crumbs, ground beef, salt and pepper.
Add 1/2 tomato mixture (4oz.), and mix thoroughly.
Place mixture in meat loaf pan. Pour remaining tomato sauce over the top of meat, and bake for 1 1/2 hrs. at 350 degrees
OR
Place meat mixture in glass ring mold or 2 qt. microproof round casserole. Pour remaining tomato sauce over the top of meat. Cook in microwave uncovered on high 12-14 minutes; Let stand covered 5-10 minutes before serving .