Yusheng , yee sang or yuu sahng also known as Lo Hei is a luck bringing appetizer usually served on the 7th day of Chinese New Year.
Families and friends gather around a table to toss the shredded ingredients served in a communal dish into the air with chopsticks. The aim is to toss high, loud and messily. While tossing rosy, auspicious and bright wishes are said out loud. The louder the wishes are said and the higher and messier the food is tossed, more good fortune Lo Hei tossing is thought to bring.
Chinese associate meanings with most of the things. 25 primary ingredients are used for making Lo Hei and each serves it’s own purpose in bringing good fortune. Raw salmon/mackerel, carrot, chopped peanuts, daikon, crystallized ginger, green radish, oil, pepper and pomelo, sesame seeds and cinnamon are the main ingredients which symbolize abundance, luck, gold and silver, a flourishing career, a sweet year, youth, smooth flow of wealth, good fortune, flourishing business and a sweet life respectively. It is served with a dressing made of plum. Via Link
The following You Tube video shows how Lo Hei is celebrated on Chinese New Year.