Food & Cooking Recipes Dessert & Treats Recipes Cake Recipes Chocolate Mousse Cake Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on July 21, 2020 Print Rate It Share Share Tweet Pin Email Servings: 12 This rich chocolate mousse cake is made with chocolate ganache, which includes finely chopped bittersweet chocolate. Ingredients Chocolate Genoise for Chocolate Mousse Cake 8 ounces bittersweet chocolate, finely chopped 3 large egg yolks ¼ cup sugar 2 tablespoons all-purpose flour 1 tablespoon cornstarch 1 ½ cups milk 1 ½ cups heavy cream Chocolate Ganache for Chocolate Mousse Cake Edible roses and rose petals Cinnamon Creme Anglaise Directions Line a 10-by-4 1/2-by-3-inch loaf pan with plastic; let excess hang over sides of pan. Line pan with chocolate genoise: Cut one 9-by-4-inch rectangle to fit bottom and two 9-by-3-inch rectangles to fit sides of loaf. Cut four 2 1/4-by-4 1/2-inch pieces; use two to fit each end of the loaf; set other two aside. Cut another 10 1/2-by-5-inch rectangle to fit top; set aside. Place chocolate in a large heat-proof bowl or the top of a double boiler set over a pan of barely simmering water; heat until melted. Set aside. Combine yolks and sugar in a medium bowl; whisk until pale yellow. Add flour and cornstarch; whisk to combine. Place milk in a small saucepan; bring to a boil. Gradually pour milk into yolk mixture, whisking constantly. Return mixture to pan; set over medium-low heat. Cook, whisking constantly, just until mixture comes to a boil. Remove from heat; immediately pass through a fine sieve into melted chocolate. Use a rubber spatula to combine; set aside to cool. When almost cool, whip the heavy cream to soft peaks, and fold into the chocolate mixture. Spoon chocolate mousse into the prepared loaf, and top with the reserved genoise. Wrap the excess plastic over the loaf, and place in the freezer overnight. Unmold cake onto a wire rack set over a rimmed baking sheet. Pour ganache over cake, coating completely. Allow ganache to set for about 10 minutes. Scrape excess ganache from baking sheet back into the bowl. Pour a second coating of ganache over cake. If ganache gets too thick, it can be rewarmed slightly over simmering water. Transfer cake to a serving platter; refrigerate for 1 hour or until ready to serve. Garnish with edible roses and rose petals just before serving. Thinly slice with a serrated knife. Serve with creme anglaise. Rate it Print