Combine dulce de leche, cream cheese, sour cream, and salt in a bowl and whisk until smooth with an electric mixer.
Place parchment paper at the bottom of a pan - springform or another baking form or dish.
Mix espresso and alcohol in a deep plate or a small dish.
Dip the biscuits in the coffee mixture and place them in an even layer to cover the bottom.
Now spread a layer of cream to cover the biscuits.
Continue until you have no more layers. The number of layers you will get depends on the size of your pan.
Cover the form with plastic wrap and place it in the refrigerator for at least 5 hours, preferably overnight.
Grate or scrape the chocolate into shavings and garnish the cake before serving.