Appearance: They are the dried seed pods of an aquatic floating plant. Because of their curved horns, dark color, and winged shape, they strikingly resemble a flying bat or a bull’s head.
Edibility & Flavor: Inside the hard, woody shell is a single starchy white nut. Once cooked, it has a texture and mild flavor similar to water chestnuts, roasted chestnuts, or sweet potatoes.
Preparation: Do not eat them raw—the raw seed contains toxins that are neutralized during cooking. They are typically boiled in salted water or steam-roasted before cracking open the shell to retrieve the edible nut.
Cultural Significance: They are popular in East Asian cuisines (particularly China, Taiwan, and Vietnam) and are traditionally consumed during the Mid-Autumn Festival as a seasonal treat.