Clean the tomatoes, onions and chop.
Season with basil, thyme, oregano, and cook for about 30 seconds to 1 minute.
Add the chopped tomatoes and continue to cook on medium low. Simmer the tomato mixture for about 10-15 minutes.
Blend until smooth or to your desired consistency. Taste and adjust the seasoning if necessary.
Pour in a sterilized container and allow to cool down completely, if you desire you can top the mixture with oil before covering. You could use place the jar in a pot with water boil, allow it to cool down completely before you store it.