Nocino is made by harvesting plump green walnuts traditionally in June around the feast day of St. John the Baptist, slicing them thinly, then macerating them for about a year in almost pure alcohol. The walnuts are then drained, pressed off (all of the press fraction is used, unlike with wine) and blended with a separate infusion of clove, coriander and true cinnamon, and sugar. Il Mallo uses about 20% less sugar than the maximum permitted by the rules for Nocino di Modena.
After another 9 months of aging the mixture is bottled. As with any of these liqueurs that predominantly are made of a single ingredient, the quality of that ingredient is very important, and Roberta and her mother Giovanna have longstanding relationships with the farmers who grow the walnuts, some near their home in Emilia and some in Campania, around Avellino.