Water chestnuts are a crunchy, starchy root vegetable that is often grown underwater in muddy and marshy areas. They are typically sold in a can on the international aisle of the grocery store. They are not usually considered low-carb, as they have 9 net carbs per 1/2 cup. I only used 1/4 cup of water chestnuts in this recipe to keep the carbs low, but you can omit them or replace them with peanuts for the same crunch!