4 pounds beef short ribs
Kosher salt and freshly ground black pepper
1/4 cup olive oil
1 large onion, diced
3 cloves garlic, coarsely chopped
5 Roma tomatoes, cut into eighths
1 cup red wine, such as Cabernet Sauvignon
3 tablespoons Dijon mustard
2 cups low-sodium beef broth
1 pound penne pasta
1/4 cup freshly grated Parmesan
1/4 cup chopped fresh flat-leaf parsley