Meanwhile, prepare the sauce. In a large skillet over medium-high heat, cook the bacon until fat is rendered. Add the ground beef and cook, breaking up the meat, until meat is about half done. Add the carrot, celery, onion, 1/4 t salt and a good pinch pepper, and continue cooking, stirring often, until meat is no longer pink and veggies are softened. Add the tomatoes with the juice, the tomato paste, and the remaining 1/4 t salt. Simmer, stirring occasionally, 20 minutes. Mix in the parsley and half and half, taste for seasoning.