Step 1: Prepare the Egg Yolk Mixture: In a heatproof bowl, whisk egg yolks and granulated sugar until combined and pale. Place the bowl over a saucepan with simmering water (not touching the water) and whisk constantly for 5-7 minutes until thick and ribbon-like. Remove from heat and cool completely.
Step 2: Make the Mascarpone Cream: In a separate bowl, beat room-temperature mascarpone cheese until smooth. Once the egg yolk mixture is cool, gently fold it into the beaten mascarpone until wonderfully combined and smooth.
Step 3: Whip the Dulce de Leche Cream: Ensure heavy cream, mixing bowl, and whisk attachments are cold. Whip the cold heavy cream until soft peaks form. Add ΒΌ cup of dulce de leche and a pinch of salt. Continue whipping until stiff peaks form. Be careful not to over-whip.
Step 4: Assemble the Tiramisu: Pour cooled strong coffee (or espresso) into a shallow dish. Quickly dip one ladyfinger at a time (1-2 seconds per side) into the coffee, ensuring they don't get soggy. Arrange a layer of coffee-dipped ladyfingers at the bottom of your serving bowls.
Step 5: Layer the Desserts: Spoon a generous layer of mascarpone cream over the ladyfingers, followed by a layer of dulce de leche whipped cream.
Step 6: Repeat Layers: Add another layer of quickly-dipped ladyfingers, then more mascarpone cream, and finally, another layer of dulce de leche whipped cream. Finish with the caramel-kissed cream on top.
Step 7: Chill: Refrigerate the assembled tiramisu bowls for at least 4 hours, or ideally overnight, allowing flavors to meld and the dessert to firm up.
Step 8: Garnish and Serve: When ready to serve, generously dust the top of each bowl with cocoa powder using a fine-mesh sieve. Shave delicate curls from a chocolate bar over the top. Serve immediately.