Heat Olive Oil in 12-inch nonstick skillet over medium-high heat and cook onion and fennel seed, stirring occasionally, 2 minutes. Add garlic and cook 30 seconds. Add ground beef and cook, breaking up with spoon, 5 minutes or until lightly browned. Stir in Sauce. Bring to a boil over high heat. Reduce heat to low and simmer covered 5 minutes. Serve over hot rotini.