Amaretti vary substantially throughout the Italian territory. In Sicily, Pasta di Mandorle (almond paste) is very popular and used in many kinds of pastries. In Sardinia, well known are Sospiri, made with sweet almonds and lemon rind. In Lazio the Amaretti of Fiuggi and of Guarcino are made of sweet and bitter almonds, egg whites and sugar on a disc of wafer paper. Also from Lazio the Paste Reali are a typical Christmas cookie made with sweet almonds, sugar and baking powder. From Tuscany, soft and sugar-coated Ricciarelli are popular in all northern Italy