This use of "water chestnut" for the two foods leads to a lot of mix-ups on websites where people label pictures of both round Chinese water chestnuts and spiky water caltrops as T. natans.

Enjoy it raw or cooked; this incredibly versatile food can do more than just amp up your Asian dishes like stir-fries, chop suey, omelettes, curries, and salads. Yes, water chestnuts are a great deal ...