Place your large skillet over medium-high heat. Once the pan is hot (about 1 minute), add your pound of ground beef directly to the skillet. Use a wooden spoon or sturdy spatula to break the meat into small, even pieces as it cooks. You're looking for a nice brown color, not gray, which means the meat is developing flavor through the Maillard reaction. After about 5 minutes, when the beef is no longer pink and beginning to brown, add your diced onion. The onion will soften and become translucent, and the entire mixture will smell absolutely incredible. This should take about 3-4 additional minutes. Don't rush this step—these aromatics form the flavor foundation for everything that follows.

Now add your salt, black pepper, and dry mustard powder directly to the meat mixture. Stir well to distribute the spices evenly. You'll notice the mustard powder creates a subtle coating over the meat. This is exactly what you want. Add the apple cider vinegar and Worcestershire sauce next, stirring to combine. The mixture should look well-coated and smell complex and inviting. Cook this spiced mixture for about 1 minute without the liquid ingredients—this allows the spices to "bloom" and become more aromatic and flavorful. This is a professional technique I use consistently because it makes an enormous difference in final taste.

Pour in your 3 cups of tomato juice and 1 tablespoon of brown sugar. Stir everything together thoroughly, making sure nothing is stuck to the bottom of the skillet. The mixture should look like a thin sauce—this is correct. The pasta will absorb liquid as it cooks, and the sauce will thicken naturally. Bring the mixture to a gentle simmer over medium heat. You're looking for small bubbles breaking the surface consistently, not a rolling boil. This should happen within 2-3 minutes.

Add your 1 cup of uncooked elbow macaroni directly to the simmering sauce. Stir well to separate any pasta that might stick together. The pasta will immediately begin absorbing liquid. Cover the skillet with a lid (or even aluminum foil if you don't have one) and reduce heat to medium-low. Let this simmer undisturbed for about 15 minutes, then stir the pasta to ensure even cooking and prevent sticking. Continue cooking, stirring occasionally, for another 5 minutes or until the pasta is tender and most liquid is absorbed. The total cooking time is approximately 20 minutes from when you add the pasta. You'll know it's ready when you can easily bite through a piece of pasta and the sauce has thickened enough to coat the back of a spoon. There should still be some liquid, but it shouldn't look soupy.

Remove the skillet from heat. Sprinkle your ⅔ cup of shredded cheese evenly over the top of the pasta and beef mixture. For extra richness, you can dot the surface with 2 tablespoons of butter before adding the cheese. The residual heat will melt everything beautifully. Let the skillet sit undisturbed for 2-3 minutes. This resting period allows the cheese to melt completely and the flavors to settle into harmony. Stir gently once the cheese is fully melted, and you're ready to serve.