Preheat oven to 400F and prepare a baking sheet with parchment paper.
Arrange quartered tomatoes, garlic, and onion on the baking sheet and season liberally with olive oil, salt and pepper. Roast in oven for 30-40 minutes or until tomatoes and onions are slightly browned, soft, and juicy.
Heat 1 Tbsp butter in a medium stock pot and add roasted tomatoes, onion, and garlic along with all the juices. Next add the chicken or vegetable broth and basil. Let simmer for 10 minutes to marry all the flavors.
Blend everything together with an immersion blender, serve and enjoy the simplicity of perfect tomatoes!
