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There are two kinds of fish balls in Hong Kong. One is smaller in size, yellow in colour, usually made with cheaper shark meat, and is sold in "strings" (串), each "string" containing five to seven fish balls "strung" on a bamboo skewer. Usually sold at food stalls, each skewer costs between five to seven Hong Kong dollars, depending on the area where it is sold. There are many stalls which support themselves just by selling this kind of fish ball, similar to hot dog stands in the United States. The fish balls can be either spicy (often called curry fish ball, though it is doubtful whether curry is used to make the spicy sauce) or not, at the same price. It is often eaten with steamed rice roll (豬腸粉), another common Hong Kong food. It is one of the most popular and representative "street foods" (街頭熟食) of Hong Kong.
The other kind is bigger in size, white in colour, made with more costly fish meat, and has a considerably different texture and taste. This kind of fish ball is usually eaten with noodles at restaurants providing Chiuchow-style noodle , and at some cha chaan tengs (lit. tea restaurant), which also provide beef ball (牛丸) and cuttlefish ball (墨魚丸). A bowl of noodle with this kind of fish ball costs $10 to 20. Readily available in traditional market and supermarket, the fish ball is also a popular ingredient for hot pot. It is a very popular street snack among kids and young adults.
In outdated Hong Kong slang, the term "fish ball girlies" (魚蛋妹) means young prostitutes, usually under the age of 18; and the brothel where these girls work is thus called "fish ball stall" (魚蛋檔). The etymology may be that the action of hand-making fishball resembles that of masturbation or that of grabbing a female's breasts (in general, the "fish ball stalls" are not designed for sexual intercourse: the clients can only caress the prostitutes and receive hand jobs).
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http://en.wikipedia.org/wiki/Fish_ball