Unlike New York styler, Neopolitan pizza sauce, or Baking Steel pizza sauce which are all uncooked. A traditional sauce for Chicago tavern-style pizza is cooked sauce, that is packed with tons of herbs and a hint of sweetness. Check out Billy's take....
Heat butter and olive oil over medium heat until butter is melted. Add garlic, pinch of salt, and red pepper and cook for 2 minutes until fragrant and lightly golden. Add tomato paste and cook for 3-5 minutes. Add tomatoes, a pinch of salt, dried herbs, and fish sauce.
Bring to boil then reduce to a simmer for 15-20 minutes. Remove from heat. Blend with an immersion blender until smooth. Season with vinegar, salt, and pepper.