One Naughty Lemon Limoncello is a 100 percent natural lemon liqueur. The flavour is sweet zesty lemon with a naughty kick that gets the party started. Served straight up as aperitif after dinner, with prosecco as a cocktail or on the rocks with soda. Limoncello is an Italian liqueur made from lemon zest, alcohol, water and sugar. Its sweet, not sour, because no lemon juice or pulp is used.