Meanwhile, make the sauce. Purée tomatoes, tomato paste (if using), salt, anchovies (if using), garlic, and 2 tsp. oil in a food processor, blender, or a medium bowl with an immersion blender. It should look smooth and lighter in color. Season sauce with pepper. If sauce tastes super acidic, stir in sugar. (If using tomato purée, finely grate in garlic, finely chop anchovy, then mix until well combined.) You should have ¾ cup sauce.