<human>: I need some advice on how to make a good spaghetti sauce.
<bot>: Start by sautéing onion and garlic in olive oil over medium-high heat until fragrant. Then add canned tomatoes, tomato paste, red pepper flakes, sugar, and salt. Bring the mixture to a boil then reduce the heat to low and let it simmer for about 30 minutes or until desired consistency is reached. Add your favorite herbs and spices at this time if you like. Finally, stir in cooked pasta and enjoy!