Aunt's daughter Huang helped her mother make iron eggs when she was eight years old. The iron eggs made by herself tasted like "grandma", but she thought that she had to ask others to apply first because she didn't know how to register the trademark, so she only applied for the registered trademark of "Iron Eggs by the Sea".

Huang said helplessly, although the local town hall knew this history, every time he always tried to invite Huang Zhangma's own "seaside iron eggs" to participate in various garden gatherings for publicity. Often, the guests always said that this was not because grandma's iron eggs were unwilling to buy them, but because she missed the taste of real grandma's iron eggs. Nevertheless, Huang 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 this sentence was originally said by Ms. Yang Biyun, who runs a breakfast shop and sells braised eggs. On one occasion, Yang Biyun had no intention of preserving the eggs for too long, and the eggs became harder and harder, black and hard. It tastes very delicious. Later, Ms. Yang called these eggs "iron eggs". Yang Biyun originally wanted to name this food "Yuanzu Iron Egg", but a chain store of "Yuanzu Food" which specializes in selling crispy noodles infringed the patent right in order not to share the same name with Yuanzu. Therefore, Yang Biyun called this iron egg "grandmother iron egg".

Making iron eggs is very time-consuming. Every day, we must use the marinade containing soy sauce and spiced formula for three hours, and then blow dry with an electric fan. Every day, we must make iron eggs according to this procedure and last for a week.