Huang Linghong, the daughter of Grandma, has been helping her mother look after the store to make iron eggs since she was eight years old, and the iron eggs made by her own hands taste like "grandma", but she thinks that because she didn't know how to register the trademark, she let others apply first, so she only applied for the registered trademark of "Iron Eggs by the Sea".

Huang Linghong said helplessly, although the local town office knows this history, every time it always tries to invite Huang Zhangma's own "seaside iron eggs" to participate in various garden tour gatherings for promotion, often the guests always say that this is not because the old woman is unwilling to buy them, but misses the taste of the real old woman's iron eggs. Nevertheless, Huang Linghong added the word "grandma" to the registered trademark to commemorate the founder of the iron egg, so the trademark became "grandma's iron egg by the sea". Because "grandma's iron egg" has long been famous, there is no place for "grandma's iron egg by the sea" in the iron egg market.

Another way of saying it is that Ms. Yang Biyun, who runs a breakfast shop and also sells braised eggs, once, Yang Biyun accidentally marinated the eggs for too long, and the eggs became harder and harder, darker and darker, and the taste was very delicious. Later, Ms. Yang called the eggs "iron eggs". Yang Biyun originally wanted to name this food "Yuanzu Iron Egg", but there is a chain store of "Yuanzu Food" that specializes in selling crispy noodles, which infringes the patent right in order not to share the same name with Yuanzu. Therefore, Yang Biyun called this iron egg "Apo Iron Egg".

The making of iron eggs is time-consuming. Every day, it must be marinated with marinade containing soy sauce and spiced formula for three hours, and then dried by electric fan. Every day, it must be made according to this procedure, and it will last for one week before the making of iron eggs is completed.