In a large pot or dutch oven, over medium high heat, heat the olive oil and sauté the onion and garlic until fragrant and translucent, about 2 minutes. Add ground beef and cook until browned, about 3-5 minutes, breaking it apart with a wooden spoon. Season well with salt and pepper.
Add the Ragu sauce,Worcestershire sauce, ketchup, mustard, broth and milk and give it a good stir. Then, stir in the pasta and bring to a boil. Once boiling, cover and lower the heat to a simmer. Cook for 8 to 10 minutes (adding more liquid if necessary) or until the pasta is al dente and liquid has reduced.
Remove pot from heat and stir in the diced tomatoes. Then, add the cheese, cover and let it stand for 2 minutes so the cheese can melt. Garnish with chopped parsley or scallions and serve immediately!