Tiramisu - Cook'S Illustrated

• 2 1/2 cups strong black coffee, room temperature
• 1 1/2 tablespoons instant espresso powder or 3 tablespoons instant coffee
• 9 tablespoons dark rum, divided (optional)
• 6 large egg yolks
• 2/3 cup sugar
• 1/4 teaspoon table salt
• 1 1/2 lbs mascarpone cheese
• 3/4 cup heavy cream (cold)
• 14 ounces ladyfingers (42 to 60, depending on size)
• 3 1/2 tablespoons cocoa, preferably Dutch-processed
• 1/4 cup semisweet chocolate (optional) or 1/4 cup bittersweet chocolate, grated (optional)

1. Combine coffee, espresso powder and 5 tbsp rum in a wide bowl. Stir until espresso dissolves. Set aside.
2. Using a whisk, hand mixer, or stand mixer with whisk attachment, beat egg yolks on low just until smooth. Add sugar and salt and beat at medium speed until pale yellow and thick, 1 1/2 to 2 minutes. Add remaining 4 tbsp rum and beat until combined, 20-30 seconds. Add mascarpone and beat on medium speed until no lumps remain, 45-60 seconds. Transfer to a large bowl.
3. In same work bowl (no need to clean), whisk cream on medium until frothy, about 1 minutes. Turn up to high and whip to stiff peaks, 1-2 minutes more. Fold 1/3 of whipped cream into eggs to lighten, then fold in remaining whipped cream gently to preserve the air.
4. Drop ladyfingers one at a time into coffee mixture. Quickly roll over, then transfer to a 13x9x2 pan. (Do not submerge the ladyfingers in the coffee; they should remain in the liquid no more than about 2 seconds total.) Continue until the pan is filled with a single layer of dipped cookies, breaking or trimming cookies to make them fit.
5. Spread half the cream mixture over the cookies, filling the pan out to the corners. Put 2 tbsp cocoa in a fine-mesh sieve and sift over the entire surface.
6. Repeat dipping and arranging ladyfingers to create a second full layer. Spread remaining cream over the ladyfingers, then sift remaining cocoa over the top. Clean edges of dish with dry paper towel, then cover with plastic. Refrigerate 6-24 hours before serving. Sprinkle with grated chocolate before serving, if using.

black coffee, espresso powder, dark rum, egg yolks, sugar, salt, mascarpone cheese, heavy cream, ladyfingers, cocoa, semisweet chocolate

Taken from www.food.com/recipe/tiramisu-cooks-illustrated-455441 (may not work)