Amaretti, the famous Italian almond cookies are so popular in their homeland that almost every region has their version of the recipe, using different proportions and combinations of the basic ingredients: sweet and bitter almonds, apricot kernels, eggs, and sugar.
Especially popular in Lazio are the soft and oval-shaped amaretti of Guarcino, made with almonds, both sweet and bitter ones, fresh egg whites, powdered sugar, and a dash of salt, placed on a wafer paper disc before baking. The region offers one more interesting spin on the amaretti cookies; in Casperia, a municipality in the province of Rieti, the amaretti Casperiani are made with egg whites, sugar, almond essence, vanilla, and hazelnuts instead of almonds.