I've been making a simple tomato sauce using tomato puree, basil, oregano, dried pasilla peppers, and garlic (as well as the left-over bits from cooking beef meatballs in the same pot). The flavor is good, but the sauce is visually very dark: a dark red that isn't very appetizing. I think this is because of the amount of basil I'm adding, but I'm not sure.
What techniques can I use or changes can I make to my recipe that will lighten the color closer to the red color of the tomato base, without changing the flavor too much?