Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Drain and set aside.

In a skillet over medium heat, add the ground beef and cook until browned. Drain excess fat.

Add the chopped onion and minced garlic to the skillet. Sauté until the onion is translucent.

Stir in the crushed tomatoes, tomato paste, oregano, basil, salt, pepper, and water. Bring to a simmer and let cook for about 15 minutes, stirring occasionally.

Add the cooked pasta to the meat sauce and toss to combine. Serve hot, garnished with Parmesan cheese and parsley.