Water chestnut, which is a common ingredient, should be sold in local supermarkets, vegetable markets, farmers' markets and other places.

Also known as horseshoe, water chestnut, peony, black taro, linden, and pear, it belongs to monocotyledonous Cyperaceae, and is a perennial herb, which is oblate, pointed on the top, smooth and shiny on the surface, purple or dark brown, growing in ponds, with dark green stems clustered on the ground and edible bulbs underground. Because it is shaped like a horseshoe, people also call it horseshoe. Its appearance is like chestnut, not only in shape, but also in taste, composition and function. Because it is produced in mud, it is also called "ground chestnut".

Eleocharis tuberosa is purple and black in skin, white in meat, sweet and juicy, crisp and delicious, and is known as "underground Sydney". Northerners call it "Jiangnan Ginseng", which can be eaten raw as fruit and vegetables. It is a popular seasonal product.