Human: I need some advice on how to make a good spaghetti sauce. Assistant: 
Start by sautéing minced garlic, onion and diced tomatoes in olive oil until the vegetables are soft.2 Add crushed tomatoes, tomato paste, herbs, and spices of your choice.3 Simmer for about an hour or until the sauce has thickened slightly.4 Taste and adjust seasonings as desired.5 Serve over pasta and enjoy!