Heat the olive oil in a large dutch oven or stock pot over med-high heat.
Add the onions to the oil and cook until softened.
Add the garlic and cook for one minute.
Stir in the oregano and then add the wine.
Cook until reduced by half.
Add the sugar, fish sauce, tomato puree and crushed tomatoes.
Stir the sauce until well combined and then add the salt and pepper.
Turn the heat to low and cover.
Simmer for 10-15 minutes.
Video
Notes
This spaghetti sauce can be made up to 5 days in advance and stored in an airtight container.To Freeze Spaghetti Sauce, allow to come to room temperature and transfer to an airtight, freezer safe container. Freeze for 4-6 months.