For a smooth, airy batter, make sure all ingredients—including butter, eggs, and mascarpone—are at room temperature.
Sifting flour, baking powder, and salt guarantees a light, lump-free batter with a fluffy consistency.
In order to include air and help the cake rise and remain light, beat the eggs and sugar until they are pale and fluffy.
To infuse the cake with flavor and prevent inflating the batter, add the limoncello gradually.
To create a lighter, airier frosting that accentuates the texture of the cake, blend mascarpone with cream cheese or whipped cream.