Jersey has an abundance of excellent restaurants (http://www.jersey.com/Food) covering most tastes. There are now three Michelin-starred restaurants Bohemia, the Atlantic and Tassilli in the island.
There are many French, Italian and Portuguese style restaurants. Chinese, Indian and Thai are well represented too. Only one each of Greek and Sushi and one Mexican, located in Colomberie or Iranian though. There are a few B.Y.O. restaurants example the Dicq Shack. Fast food chains, such as McDonalds are in town, although there is only 1 McDonalds and 1 Starbucks..located at the Airport.
There are occasionally themed "food weeks" celebrating the different cultures in the Island. Every October for a little over a month there is a Tennerfest (http://www.tennerfest.com/) where you can explore many of the world-class restaurants.