That kind of plant is called "Ginseng Fruit", also known as "Ginseng Fruit". It is the tuberous root of a plant in the Rosaceae family and the Potentilla genus.

The lower part of the root of this plant swells into a spindle or oval shape. It is dug out and dried in the sun to become commercial fern.

Fern hemp contains high amounts of starch and sugar, so it is sweet. It also contains a variety of vitamins and magnesium, zinc, potassium, and calcium. Has high medical and nutritional value. Eating regularly is good for your health.

This thing is found in Gansu, Qinghai and Tibet. Qinghai has more of it and is considered a specialty.