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1.
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Place sugar and 2/3 cup water in a small saucepan.
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Bring to a boil over medium heat, stirring occasionally.
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Remove from heat; stir in espresso and Kahlua.
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Let the syrup cool.
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2.
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Using a serrated knife, cut the Vanilla Sponge Cake in half horizontally, making two layers.
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Place one layer in the bottom of a 9x9x2-inch baking pan.
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Using a pastry brush, brush with 3/4 cup cooled syrup.
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Sift 2 tablespoons ground espresso over cake.
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3.
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Place espresso ice cream in the bowl of an electric mixer.
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Beat on low speed with the paddle attachment until spreadable.
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Spread ice cream over cake; top with second layer of sponge cake.
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Brush with remaining syrup.
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Transfer cake to freezer for 20 minutes.
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4.
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Remove cake from freezer; sprinkle with the remaining 2 tablespoons of ground espresso.
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Place coffee ice cream in a mixer bowl.
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Beat on low speed until spreadable.
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Spread ice cream over cake, forming large swirls.
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Return to freezer; freeze until completely hardened.
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To serve, garnish with chocolate curls.
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Vanilla Sponge Cake: 1.
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Heat oven to 350F.
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Butter a 9-inch-square baking pan.
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Line pan with parchment paper, and butter again.
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Flour the pan, and set aside.
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In a small bowl, sift together the flour and cornstarch; set aside.
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2.
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In the bowl of an electric mixer fitted with the whisk attachment, beat the egg yolks, vanilla, and 1/2 cup sugar on high speed until thick and pale, about 5 minutes.
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Transfer the egg-yolk mixture to a large bowl.
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Wash and dry the mixer bowl and the whisk attachment.
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3.
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Combine the egg whites and salt in the mixer bowl, and beat on medium speed until whites hold soft peaks, about 1 1/2 minutes.
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With mixer running, slowly add the remaining 1/4 cup sugar.
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Continue beating until stiff and glossy, about 1 minute.
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4.
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Fold the egg-white mixture into the egg-yolk mixture.
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In three additions, fold the reserved flour mixture into this new mixture.
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Transfer the batter to the pan, and smooth the top with an offset spatula.
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Bake until a cake tester inserted into middle comes out clean, 35 to 40 minutes.
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Transfer pan to a wire rack to cool; turn out the cake, and wrap it in plastic wrap until ready to use.
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Chocolate Curls: 1.
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Set a heat-proof bowl, or the top of a double boiler, over a pan of barely simmering water.
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Melt chocolate and shortening in bowl, stirring occasionally.
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2.
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Divide chocolate between two 11x17-inch baking pans; spread evenly with an offset spatula.
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Chill until your finger makes a mark, but not a hole, when touching the chocolate.
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3.
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Remove pans from refrigerator.
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Hold a sturdy metal pancake spatula at a 45-degree angle to pan; scrape away from you, forming curls.
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If chocolate is too brittle, quickly wave pan over top of warm stove.
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If too soft, briefly return to refrigerator.
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Refrigerate in an airtight container up to 2 weeks.