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In page Apple sauce:

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Apple sauce is made by cooking apples with water or apple cider (fresh apple juice). More acidic apples will render a finer purée; the highly acidic Bramley apple creates a very fine purée. The apples may or may not be peeled. If they are not peeled, the peels and seeds are typically separated in a food mill.[1] Sugar and spices such as cinnamon, allspice, and even Red Hot candies may be added for flavor. Lemon juice, citric acid, or other acidifiers may be used to preserve the color and ensure a high enough acidity for safe storage. Ascorbic acid (vitamin C) also preserves the color.[citation needed]