Reduce heat to low/medium and cook, uncovered for approximately 45 minutes. Stir regularly to prevent sauce from sticking to the bottom.
When sauce is almost ready, boil your pasta. Add 1 teaspoon of salt to a pot of boiling water and cook spaghetti according to the instructions on the package.
500 grams spaghetti, 1 teaspoon salt, for the pasta water
Drain pasta once cooked. Serve on plates. Top with meat sauce and sprinkle with mizithra cheese if desired.