HEAT olive oil in a medium saucepan over medium heat. Add minced onion and garlic and cook for 5 minutes.
ADD crushed tomatoes, oregano, and salt.
SIMMER partially covered for 15 minutes, stirring occasionally.
OPTIONAL: Blend in a blender or with an immersion blender for a smoother consistency, if desired.
ADD fresh chopped basil and serve.
TO FREEZE: Store in a sealed container for up to 6 months.