One of the key ingredients that make a hot dog in Krakow special is the Polish mustard. This tangy and slightly spicy mustard adds a unique flavor to the hot dog. It is made from a blend of mustard seeds, vinegar, and spices, giving it a distinct taste. The combination of the smoky sausage and the zesty mustard creates a delicious and satisfying flavor profile. Hot dogs with Polish mustard can be found at various food stalls and kiosks in Krakow, offering a classic and flavorful option for hot dog enthusiasts.