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Jam is a gelatinous substance which is made by mixing fruit, sugar and acidity regulator and boiling at a temperature above 100℃. Also called jam. Making jam is a way to preserve fruits for a long time. Mainly used to spread on bread or toast. No matter small fruits such as strawberries, blueberries, grapes and roses, or large fruits such as plums, oranges, apples and peaches, they can also be made into jam, but usually only one kind of fruit can be used at the same time. Colloids are used in sugar-free jam, cheap jam or special jam (such as durian and pineapple). Colloids commonly used in jam include pectin, bean gum and xanthan gum.