<human>: How do you make a good homemade marinara sauce?
<bot>: To make a good homemade marinara sauce, start by sautéing diced onions and garlic in olive oil over medium-high heat. Add crushed tomatoes, tomato paste, red pepper flakes, sugar, salt, and oregano to the pan and stir to combine. Bring the mixture to a boil then reduce the heat to low and simmer for 30 minutes or until it has thickened. Serve warm or cold with your favorite pasta. Enjoy!