Vietnamese Culture DictionaryWater Chestnut - Vietnam Traditional Food Posted on December 10, 2015November 8, 2018 by Stephen 10 DecWater Chestnut (Củ Ấu) is an aquatic plant with white flowers. The cooked fruit has a fragrant, buttery taste. When the leaves rise at an angle to the surface of the water, the fruit is ripe for harvesting.Water Chestnut (Cu Au) Stephen Waterfalls in Vietnamese CultureWar Memorial in Vietnamese Culture