Basic Tomato Sauce

This sauce is the base of so many dishes it deserves its own post; so it can be used as reference.
My version of the classic sauce has a dash of vinegar to give this lovely sauce a slight piquancy.

Ingredients:

• 400 gr crushed tomatoes
• 1 small onion, chopped
• 1 tbsp vinegar
• salt and pepper

Gently fry the onion for 5 minutes in 2 tablespoons of olive oil. Add the vinegar and let it reduce for one minute. Pour the tomato and season to taste. Let the sauce cook for 20 minutes.
Serve with pasta, on its own or sprinkled with Parmesan shavings.
Or use as a base for other dishes.