Somewhere between a lemon drop cocktail, a lemon drop candy, and a lemon cupcake. Using Italian limoncello liqueur in place of lemon juice gives these cupcakes just a mild lemon taste. Add another dash of limoncello to the frosting, a sprinkle of crushed lemon drop candies, and a glazed lemon slice for a fun cupcake. Mascarpone frosting, with its rich whipped cream taste, is a perfect accompaniment to lemon cupcakes. Limoncello is a sweet, yellow lemon liqueur from Italy.