From the Fish Eaters site: "Lucky foods" are eaten, all of which vary from place to place. In Spain, one must eat 12 grapes at midnight to fend off evil in the following year. Pea Soup is a German "lucky food," and in France it is oysters. In the United States, black-eyed peas are consumed, along with collard greens and hog jowls (typically on January 1).
"Silvestering" was an old custom of begging for food on St. Sylvester's night, but now fireworks are usually the case.
St. Sylvester I | Saint of the Day
Catholic Online - St. Sylvester
Fish Eaters: St. Sylvester
A History of New Years
Do You Know What Sylvester Is?