Do you have to peel tomatoes for sauce?

While not absolutely necessary, peeled tomatoes produce a better sauce. Remnants of tough tomato skins are not pleasant in tomato sauce. However, unpeeled tomatoes may be cooked then passed through a sieve or food mill to remove skins. Alternatively, place tomatoes in boiling water for one to two minutes, drain and rinse under cold water. The peels will slip off easily.