Heat the olive oil in a large pan over medium heat. Add the onions and sauté until lightly golden, 2 to 3 minutes. Add the garlic and fry another minute.
Add the ground beef, fry until fully cooked and no pink shows at all in the meat (about 8 minutes). Add the oregano and tomato paste and mix with the meat.
Add the tomatoes, parsley, and bring to a boil. Season with the salt and pepper. Reduce the heat to low, and cook for at least 15 minutes (you can cook longer for a deeper flavor).
In the meantime, cook the spaghetti according to the package instructions. Drain and serve topped with the sauce and Parmesan cheese.
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