Do you have that bottle of Baileys Irish Cream lurking at the back of the booze cupboard you occasionally stumble upon, think about, then return to the back of the cupboard?
Well get it out because here is the best use I know for it.

 

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9 teaspoons instant espresso powder dissolved in 1½ cups water (cooled)
1 cup Baileys Irish Cream
14 oz Savoiardi cookies
2 large eggs
⅓ cup superfine sugar
1 lb mascarpone cheese
2 ½ teaspoons unsweetened cocoa powder

Mix the coffee with ¾ cup of the Baileys in a shallow bowl. Dip the cookies into this liquid; let them soak on each side enough to become damp but not soggy. Line the bottom of an 8½ inch square glass dish with a layer of cookies.

Separate the eggs, but keep only one of the whites. Whisk the two yolks and the sugar together until thick and a paler yellow, then fold in the remaining ¼ cup of Baileys, and the mascarpone to make a mousse-like mixture.

Whisk the single egg white until thick and frothy; you can do this by hand with such a little amount. Fold the egg white into the “yolky” mascarpone, and then spread half of this mixture on top of the layer of cookies.

Repeat with another layer of soaked savoiardi, and then top with the remaining mascarpone mixture.

Cover the dish with clingfilm and leave in the fridge overnight. When you are ready to serve, push the unsweetened cocoa through a small tea strainer to dust the top of the tiramisu.