Chocolate Frosting

• 1 pound bittersweet chocolate
• 12 ounces semisweet chocolate
• 3/4 cup egg whites (4 to 5 extra-large eggs), at room temperature
• 1 1/2 cups granulated sugar
• 1/4 teaspoon cream of tartar
• 3/4 teaspoon kosher salt
• 1 1/2 pounds unsalted butter, at room temperature
• 3 teaspoons pure vanilla extract
• 3 teaspoons instant espresso powder, dissolved in 1 1/2 teaspoons water
• 3 tablespoons dark rum, optional

Chop the chocolates and place them in a heat-proof bowl set over a pan simmering water. Stir until melted and set aside until cooled to room temperature.

Mix the egg whites, sugar, cream of tartar, and salt in the bowl of an electric mixer fitted with a whisk attachment. Place the bowl of egg whites over the pan of simmering water and heat the egg whites until they are warm to the touch, about 5 minutes. Return the bowl to the electric mixer and whisk on high speed for 5 minutes, or until the meringue is cool and holds a stiff peak.

Add the butter, 1 tablespoon at a time, while beating on medium speed. Scrape down the bowl, add the melted chocolate, vanilla, espresso, and rum, if using, and mix for 1 minute or until the chocolate is completely blended in. If the buttercream seems very soft, allow it to cool, and beat it again.

Carrot and Pineapple cake

• 2 cups granulated sugar
• 1 1/3 cups vegetable oil
• 3 extra-large eggs, at room temperature
• 1 teaspoon pure vanilla extract
• 2 1/2 cups plus 1 tablespoon all-purpose flour, divided
• 2 teaspoons ground cinnamon
• 2 teaspoons baking soda
• 1 1/2 teaspoons kosher salt
• 1 cup raisins
• 1 cup chopped walnuts
• 1 pound carrots, grated
• 1/2 cup diced fresh pineapple

For the frosting

3/4 pound cream cheese, at room temperature
1/2 pound unsalted butter, at room temperature
1 teaspoon pure vanilla extract1 pound confectioners' sugar, sifted

Preheat the oven to 350 degrees F.

Butter 2 (8-inch) round cake pans. Line with parchment paper, then butter and flour the pans.

For the cake:

Beat the sugar, oil, and eggs together in the bowl of an electric mixer fitted with the paddle attachment until light yellow. Add the vanilla. In another bowl, sift together 2 1/2 cups flour, the cinnamon, baking soda, and salt.

Add the dry ingredients to the wet ingredients. Toss the raisins and walnuts with 1 tablespoon flour. Fold in the carrots and pineapple. Add to the batter and mix well.

Divide the batter equally between the 2 pans. Bake for 55 to 60 minutes, or until a toothpick comes out clean. Allow the cakes to cool completely in the pans set over a wire rack.

For the frosting:

Mix the cream cheese, butter and vanilla in the bowl of an electric mixer fitted with the paddle attachment until just combined. Add the sugar and mix until smooth.

Place 1 layer, flat-side up, on a flat plate or cake pedestal. With a knife or offset spatula, spread the top with frosting. Place the second layer on top, rounded side up, and spread the frosting evenly on the top and sides of the cake.