This Beef-And-Radicchio Skillet Pasta is a hearty and flavorful dish that combines tender beef, bitter radicchio, and al dente pasta. The beef is seared to perfection and then simmered with onions, garlic, and radicchio, creating a rich and savory sauce. The pasta is cooked separately and then tossed with the beef mixture, allowing the flavors to meld together. This dish is perfect for a cozy weeknight dinner or a special occasion.