The Place Has Two Yolk Specialties

Two-yolk duck eggs are nutritious and rare, but diners will find this specialty throughout the restaurants in Cao Biao.
The place has two yolk specialties
Inside a restaurant in Yangzhou, a city in China's eastern Jiangsu province, the waiter brought Anne Ewbank, an American gourmet, a plate of boiled duck eggs. It seems that this is a popular dish. But when she looked closer, Anne saw that each egg had two yolks, instead of one. That morning, she had breakfast while wondering: How can restaurants selling zaocha (morning cake tea) guarantee an unlimited supply of two yolks?
Two-yolk duck eggs are a local specialty

. Photo: Sharyne Tu.
She later learned that the eggs were served with dumpling soup and sandingbao (steamed cake with bamboo shoots, chicken and pork), not by accident. These eggs come from the nearby town of Cao Biao, famous for its two-yolk duck eggs
Although commonly referred to as a suburb of Yangzhou, Gao Biao can be thought of as a city with a population of nearly one million.



Living in the middle of rivers, lakes and Dai Van Ha canal, the people of Cao Biao mainly live by raising waterfowl. According to history professor Antonia Finnane, in Cao Biao, people raise ducks, eat ducks, sell and give ducks, especially during family holidays. When meeting or having new members, people in Cao Biao often give ducks as wishes for each other's best.
The female Cao Biao has smooth brown feathers. Photo: Sipa Asia / Alamy.
The Cao Bau tourism websites advertise that the local duck industry dates back to the sixth century. Over hundreds of years, gourmet, and many writers, poets .



. have praised the green and white eggs of the brown duck Cao Biao. But it is unclear when, Cao Biao duck farmers can make the strange appearance of a two-yolk egg certain. Two-yolk duck eggs are more nutritious, and their rarity makes them considered a blessing. Furthermore, two yolks are always six to eight times more expensive than a regular egg.
The local farmers diligently raise the Cao Biao duck for generations to create the double yolk. According to a 2010 Yangzhou University study, a two-yolk egg is often damaged before hatching. If it hatches, the ducks will be severely deformed or stick together.



2 - 10% of the eggs produced by the Cao Ducks have two yolks.
The farmer could immediately spot a double-yolk, though the shell is no different from single yolks. But there is one sure way for them to look inside an egg without breaking it: Shine a light into the egg, the double yolk appears as two gray shadows.
Before the modern equipment was available, farmers in Cao Biao would scrape duck eggs with candles. Today large farms use light conveyor belts, and many places are researching algorithms to apply computer vision technology, double-egg recognition. Photo: Alamy.
Whether the eggs are single or double yolk, the farmer then soaked in brine, packaged them, and sent them to local restaurants and eateries. The eggs are boiled and sliced, the yolks are orange-red in color, rich in oil and rich in sweetness, perfect for morning tea and cakes.




Earlier this year, Gao Biao held the 15th double yolk duck egg festival. This event spurred local investment projects such as the opening of the Chinese Duck Culture Museum in 2011, and ceremonies. The celebration is increasingly popular. If you cannot be present in Cao Biao during the annual festival in April, you can enjoy two yolk specialties at many tea houses, restaurants and eateries in town.
According to Bao Ngoc / Vnexpress
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