Warm olive oil in a large saute pan. Add onion and cook a few minutes, until softened. Add garlic, and saute until fragrant. Add ground beef and Italian sausage, and cook until no longer pink. Drain any grease from the pan. Add the tomatoes, sauce, paste, and balsamic to the pan and stir to combine, then add the herbs, a tsp of kosher salt, and 1/2 tsp of pepper, or to taste. I typically will add up to 1/2 cup of hot water to the paste can to clean off remaining bits of paste, and I pour it from can to can to "rinse" the cans, then add the tomato water to the pan. Bring sauce to light boil, then simmer the sauce for an hour, or so, while you're preparing and roasting the squash. Top each plate of squash with sauce, garnish with freshly grated Parmesan cheese, and serve.