It is "water chestnut" commonly known as horseshoe, also known as ground chestnut. The accurate description of its skin color should be "dark brown":

"Water chestnut" is a cold food and has lower It can not only clear away heat and promote fluid production, but also supplement nutrition.

It has the functions of clearing away heat and purging fire, cooling blood and detoxifying, diuretic and laxative, resolving dampness and phlegm, digesting food and removing swelling. It is most suitable for patients with fever.

Tip: Water chestnuts should not be eaten raw, because water chestnuts grow in mud, and more bacteria and parasites may be attached to the outer skin and inside. Therefore, they must be washed and cooked thoroughly before eating, and they must be cooked thoroughly. Ripe water chestnuts are sweeter. Water chestnuts are raw and cold foods, which are not suitable for people with spleen and kidney deficiency and blood stasis.