Cook ground beef, 1/2 cup of the onion and garlic in large 12 inch nonstick skillet (or a well seasoned cast iron skilllet) over medium-high heat, stirring occassionally, until beef is no longer pink.
Stir in macaroni, broth, tomato sauce, Worcestershire sauce, mustard, 1/2 teaspoon salt, and 1/4 teaspoon pepper and bring to boil. Cover, reduce heat to low, and simmer, stirring occasionally, until macaroni is tender, 8 to 10 minutes.
Stir in cheese, pickles, and remaining 1/2 cup onion. Season with additional salt and pepper to taste.
Notes
Sometimes I will stir in a couple of teaspoons of sugar with the tomato sauce to give it the very subtle sweet similar to ketchup on a burger. This is optional and great either way!Adapted from Cook's Country Oct/Nov 2013