To garnish the doughnuts it is common to use sour cherries or the jam which derives from it. The Amareno cherry comes from the Middle East, is said to have been brought by a Roman general, Luccullo. Amareno cherries are widely used in the culinary field, and are rich in vitamins C and B. It’s also interesting to note that the stems of the fruits, when dried, are used as potent diuretics and treatment for cystitis.