Step 1

Heat a large pot over medium-high heat. Add beef to the pot, sprinkle with salt and pepper, crumble into small chunks with a wooden spoon and cook until lightly browned. Use a slotted spoon to transfer to a plate.

Step 2

Drain all but 2 tablespoons of the fat from the pan and set over medium-low heat (if you don't have enough fat in the pan, add a tablespoon of olive oil). Add the onion, bell pepper, and garlic and cook, until the onion is translucent, about 7 minutes.

Step 3

Return beef to pot then stir in crushed tomatoes, tomato sauce, tomato paste, Italian seasoning, and sugar. Bring sauce to a boil, then immediately reduce heat and simmer, uncovered for 1 hour. Adjust seasoning as needed.

Step 4

Meanwhile cook spaghetti in well-salted water, according to package instructions. Drain well and toss with sauce. Sprinkle with parsley and serve. Pass grated Parmesan.