Amaretto is a sweet almond liqueur from Saronno, Italy, which gives this margarita its Italian flair. Not only is this liqueur delicious in cocktails, but it also adds a richness to desserts, such as my amaretto-strawberry-Nutella puff pastry tart. While you can pick up amaretto from different distillers, Disaronno is the top-shelf brand and my favorite choice.