Kopp's Frozen Custard is a restaurant chain located in the Milwaukee, Wisconsin area. It specializes in frozen custard and large "jumbo" hamburgers. Founded by Elsa Kopp in 1950, the restaurants continue to be heralded by local publications for their quality food. They have locations in three Milwaukee suburbs—Greenfield, Brookfield, and Glendale. Kopp's was the first custard stand to offer a special "flavor of the day" in addition to the more traditional chocolate and vanilla flavors.