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"I like eating cha ruoi in the winter. You've got the sweet and sour flavour from the dipping sauce, and the herbs are cooling... it is very unique," Hoang Thi Thu Hang told AFP.

"I like eating cha ruoi in the winter. You've got the sweet and sour flavour from the dipping sauce, and the herbs are cooling... it is very unique," Hoang Thi Thu Hang told AFP.

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