Wash the tomatoes
Remove stems
Score the bottoms with a small X
Blanch the tomatoes in boiling water for 30 to 60 seconds
Transfer the tomatoes to ice water
Peel off the skins
Remove the cores
Chop the tomatoes
Heat olive oil in a pot
Add chopped onion and cook until soft
Add minced garlic and cook briefly
Add the chopped tomatoes
Add salt
Add black pepper
Add sugar if needed
Add dried basil or oregano
Simmer the sauce until thickened
Stir occasionally
Taste and adjust seasoning
Blend if a smoother sauce is desired
Serve or store the sauce