Making Tiramisu is straightforward. Follow these simple steps to create this delightful dessert:

1. Prep Ingredients: Gather all your ingredients to ensure a smooth process.
2. Whisk Egg Yolks: In a medium bowl, whisk together the egg yolks and granulated sugar until it turns pale and creamy.
3. Heat Milk: In a saucepan, gently heat the milk over medium heat until it begins to steam, but do not let it boil.
4. Combine Mixtures: Gradually whisk the warm milk into the egg yolk mixture until fully combined.
5. Thicken Mixture: Return the mixture to the saucepan and cook over low heat for about 5 minutes, stirring constantly, until it thickens slightly. Remove from heat and let it cool.
6. Prepare Whipped Cream: In a separate bowl, beat the heavy cream until stiff peaks form.
7. Incorporate Mascarpone: Once the egg mixture is at room temperature, fold in the mascarpone cheese until fully combined.
8. Combine Mixtures: Gently fold the whipped cream into the mascarpone mixture until smooth and creamy.
9. Prepare Coffee Mixture: In a shallow dish, mix together the brewed espresso and coffee liqueur (if using).
10. Soak Ladyfingers: Quickly dip each ladyfinger into the coffee mixture, ensuring they are soaked but not soggy.
11. Layer the Ingredients: In a serving dish, create alternating layers of soaked ladyfingers and mascarpone mixture. Start with ladyfingers at the bottom and finish with mascarpone on top.
12. Repeat Layers: Repeat the layering process until all your ingredients are used, ending with a layer of the mascarpone mixture.
13. Chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours, preferably overnight, to allow the flavors to meld.
14. Dust with Cocoa: Before serving, dust the top with cocoa powder and sprinkle with dark chocolate shavings if desired.

Following these instructions will help you achieve a magnificent Tiramisu that is sure to impress anyone lucky enough to taste it!