Combine apple and water in a covered saucepan. Cook on medium heat for 10 – 15 minutes, or until apples are tender and water is evaporated. Put apples through a food mill, or puree in a blender or food processor. Taste and add sugar, if desired. Reheat to dissolve and blend in sugar.
Store in refrigerator for up to one week, or freeze for longer storage.
Makes 6 servings.