"For the unfamiliar, the old fashioned cocktail in just about every place other than Wisconsin is traditionally made with a whiskey, like bourbon, sugar and bitters.
But in Wisconsin, brandy usually replaces whiskey — and it’s most often poured over a mixture of muddled cherries, orange slices, sugar and bitters. Depending on how sweet or sour the imbiber likes it, the concoction is then topped with a lemon-lime soft drink, sour mix, club soda, or some combination."
https://apnews.com/article/wisconsin-old-fashioned-state-cocktail-493498c018a66a121551c54fa7e8ad76