Along with Szeged, Kalocsa is the largest producer of paprika, the piros arany ('red gold') so important to Hungarian cuisine. You can learn a lot more than you need to know about its development (it was first mentioned in documents way back in the 16th century), production and beneficial qualities (it is far richer in vitamin C than citrus fruits) at the Paprika Museum.
If you happen to be in Kalocsa in September, get out to any of the nearby villages to see the green fields transformed into red carpets.