Sour, a kind of wild vegetable snack in the countryside. It's probably the equivalent of chewing gum in the countryside.

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Acidity is the whole grass of Polygonum polygonum. Synonyms: Polygonum polygonum, Polygonum polygonum, sour ginger, sour wood pulp

It tastes double, but it is shorter and softer than the acid of the fruit.

It is suitable for making snacks.

Often found under grass nests and dwarf shrubs

It's common in the north.