Take a pairing knife and mark/cut "X"s in toe bottoms of the Tomatoes ( The opposite end the vine was connected to )
Boil pot of water
Place tomatoes into hot water for around 90 seconds, or till the peel starts to come off.
Peel all tomatoes and cut i them into quarters
Chop Onion medium size
Remove water from the pot and add one tablespoon of butter and 1 tablespoon of olive oil
Sweat the onion for 3 minutes then add the tomatoes and cook for 10 minutes
Next, use a blender or immersion blender and blend until smooth. This is where you would want to add any additional flavors like oregano, parsley, basil. Just be careful to not add too much.
Add smooth tomatoes puree back to the pot and cook till desired consistency.
You could add the tomato paste at this point for deeper color or just cook the sauce awhile and the sauce will darken in color.