Should You Simmer The Spaghetti Sauce Covered Or Uncovered?

When cooking spaghetti sauce, should you cover or uncover the pot? Some say uncovered is better because it allows the steam to evaporate faster, thus reducing the amount of fat. Others argue that covered is better because it prevents splatter. Which way is best? There are two main types of sauces: tomato-based and meat-based. Tomato-based…