Wash the tomatoes
Remove stems
Blanch the tomatoes in boiling water for 30 to 60 seconds
Transfer the tomatoes to ice water
Peel off the skins
Remove seeds if desired
Chop the tomatoes
Heat olive oil in a pan
Add chopped onion and garlic
Cook until softened
Add the chopped tomatoes
Stir in salt and black pepper
Add dried basil or oregano
Simmer on low heat until thickened
Stir occasionally
Taste and adjust seasoning
Serve over cooked spaghetti