Preheat oven to 350 degrees F.

Reserve 1/4 cup tomato sauce.

In a large bowl, combine ground beef, remaining tomato sauce, bread crumbs, onion, egg, Worcestershire sauce, thyme, garlic salt and pepper. Mix lightly but thoroughly.

Divide mixture into thirds and shape to form three loaves, each about 1-1/2 inches thick. Place on rack in open roasting pan.

Combine reserved tomato sauce, brown sugar and mustard. Spread over top of loaves.

Bake in 350 degrees F oven 1 hour (or until no longer pink in middle and juices run clear). Check with meat thermometer - should be 160 degrees F in center.

Photo and Recipe Courtesy of the Texas Beef Council.