Meanwhile, in a large non-stick skillet over medium-high heat, brown the onion, garlic and beef in the butter. As the meat browns, break it up with a wooden spoon, about 10 minutes. Season with salt and pepper. Sprinkle with the flour and paprika and cook for 1 minute, stirring constantly. Add the broth, ketchup and Worcestershire sauce. Bring to a boil and simmer for 2 minutes or until the sauce has thickened. Adjust the seasoning.