Preheat Oven to 425°

Mix Fresh Roma Tomatoes (Halved Lengthwise), half of the Onion (1/2" Slices), 2 Cloves of Garlic (Whole or Halved), 2 Tbsp Olive Oil, Balsamic Vinegar, and Salt and Pepper on a baking sheet. Roast, in one even layer, for about 25 Minutes or until they develop color.

In a large soup pot, add the other 2 Tbsp Olive Oil. Add the other half of the Onion (Diced), the Thyme, Red Pepper Flakes, and a little salt, cook over Med Heat until soft and a golden color develops. Add other 2 Cloves Garlic (Minced), cook another 1 - 2 Minutes, stirring frequently.

Add the Canned San Marzano Tomatoes and Chicken Broth. Turn up heat to Med High, and bring to a boil. Reduce heat to Medium again, and simmer for about 20 Minutes. Tomatoes should be soft enough to start breaking down with fork. Add Basil, Sugar, and roasted Tomato/Garlic/Onions, simmer for another 5 - 10 Minutes. I like to squish the roasted garlic into a paste before I add it in. Remove Basil (If fresh), and season with Salt and Pepper to taste. Turn off heat.

Using a heat safe regular blender or an immersion blender, puree soup until smooth, then sift through a strainer. Add strained soup back to soup pot, and turn heat to Med. Simmer for a few minutes, then add the Heavy Whipping Cream. Add Parmesan, Butter, and Tomato Paste, if using. Taste for seasoning. Stir and serve.