Brown sweet Italian sausage and ground chuck together. Cook until the pink is gone and drain the fat. Add a diced onion to the pan along with the cooked meat. Cook 15 minutes over low medium until the meat caramelizes and the onion is soft.
Add minced garlic and cook 1 more minute.
Add crushed tomatoes, tomato sauce, tomato paste, water, sugar, dried parsley, Italian seasoning, salt, pepper and fresh parsley. Stir. Cover and simmer for an hour.
For the bechamel, melt 4 TB butter in a saucepan and add flour. Whisk and cook 2 minutes.
Add whole milk and heavy whipping cream and continue whisking over medium heat until thick.
Add parmesan cheese, salt and pepper and whisk until blended and thick.
Cook a pound of cavatappi pasta in salted water until just under al dente, about . Drain.
Mix pasta into the meat sauce. Stir. Add to a 9x13 pan. Cover with the bechamel sauce. Top with parmesan cheese and bake at 350 degrees until it's brown and bubbly on top.