As a consequence of the large German immigration to Wisconsin, German meals found their way into the local eating habits. Bratwursts are common and well liked, with Sheboygan claiming to be the home of the bratwurst. The Bratwurst is a state delicacy served during summer cookouts, preferably boiled in beer prior to being grilled.
The modern hamburger was said to have been first served as a meatball-like product when its creator realized they stayed on the bun better if flattened. It was first sold at a Seymour, WI fair.
Frozen custard is also a Wisconsin delicacy not found often outside the Midwest. Frozen custard is similar to ice cream it is NOT yogurt!. It is unique in that there is far less air in it making it less "fluffy" and far more smooth and creamy. It contains egg, making it richer and creamier. It has an inappropriate reputation as unhealthy relative to ice cream when in fact most frozen custards have less calories, less fat and less sugar, being less healthy only in that it has slightly more cholesterol than ice cream.
Wisconsin and the surrounding area is famous for its dairy products, and there are various regional specialties following this theme. Even fast-food chain restaurants in this region often give the option of fried cheese curds as a side in addition to the more common french fries.