Table of Contents

Genoise Layer Cake With Rum Syrup and Whipped Cream Frosting

The first time I tasted a Genoise cake was at my grandmother’s birthday party. It wasn’t just the cake itself – light, airy, and soaked in a mysterious, fragrant syrup – but the whole experience. The elegant layers, the billows of whipped cream, and the slight, mischievous wink my grandmother gave as she served it, hinting at the rum within, all wove a spell. It was a grown-up cake, a celebration of sophistication and joy, and I’ve been chasing that memory ever since.

Recipe Overview

Prep Time: 2 hours
Cook Time: 30 minutes
Total Time: 4 hours
Servings: 12
Yield: 1 Cake
Dietary Type: Not Gluten-Free

Ingredients

CAKE

1/4 cup unsalted butter, melted, plus more for the cake pans
9 large eggs, separated
1 1/2 cups sugar
1 teaspoon vanilla
1 pinch salt
1 1/2 cups cake flour, sifted

SYRUP

1 cup sugar
2 tablespoons light rum

WHIPPED CREAM

3 1/2 cups heavy cream
1/4 cup powdered sugar
1/2 teaspoon vanilla

PASTRY CREAM

2 cups whole milk
1/2 cup sugar
1/2 vanilla bean, halved lengthwise, seeds scraped and reserved
1 pinch salt
4 large egg yolks
1/4 cup cornstarch
2 tablespoons unsalted butter, cut into small pieces

Equipment Needed

Two 9-inch cake pans
Parchment paper
Electric mixer (stand or hand-held)
Heatproof bowl
Whisk
Saucepan
Cake racks
Wooden Skewer
Kitchen Shears
Plastic Wrap

Instructions

Preheat your oven to 350 degrees F (175 degrees C).
Butter two 9-inch cake pans thoroughly. Line the bottom of each pan with parchment paper circles to ensure the cakes release cleanly. Set the prepared pans aside.
In the heatproof bowl of an electric mixer, whisk together the egg yolks and 1 cup sugar. Set the bowl over a pan of simmering water (double boiler setup). Whisk constantly until the sugar has dissolved and the mixture is warm to the touch, about 3 to 4 minutes. Be careful not to scramble the eggs.
Attach the bowl to an electric mixer fitted with the whisk attachment. Add the vanilla and salt. Beat on medium speed until the mixture is pale and thick, resembling a ribbon when it falls from the whisk, about 3 to 5 minutes. This step is crucial for incorporating air and creating the light texture of the Genoise. Transfer the mixture to a large bowl.
In the clean, dry bowl of an electric mixer fitted with the whisk attachment, beat the egg whites on medium-high speed until soft peaks form. Gradually add the remaining 1/2 cup sugar, beating until stiff, glossy peaks form. Be careful not to overwhip the egg whites, as this can make them dry and difficult to incorporate.
Fold one-third of the egg white mixture into the yolk mixture. This lightens the yolk mixture and makes it easier to incorporate the remaining egg whites. Gently fold in the remaining egg white mixture, being careful not to deflate the batter.
Fold in the flour, then the melted butter, until just combined. Do not overmix, as this will develop the gluten in the flour and result in a tough cake.
Divide the batter evenly between the prepared pans.
Bake until a cake tester (or toothpick) inserted into the centers comes out clean, about 25 to 30 minutes. The cakes should be golden brown and spring back lightly when touched.
Turn out the cakes onto racks immediately, then remove the parchment paper. Reinvert the cakes (so the tops are facing up) and let cool completely. This helps prevent the cakes from sinking.
Prepare the Syrup: In a saucepan, bring the sugar and 1 cup water to a boil. Cook, stirring constantly, until the sugar has dissolved. Stop stirring and bring to a boil. Reduce heat and simmer for 5 minutes. Remove from heat and stir in the rum. Let cool completely.
Make the Whipped Cream: In a clean bowl of an electric mixer fitted with the whisk attachment, beat the cream, powdered sugar, and vanilla on medium-low speed until medium peaks form. Be careful not to overwhip the cream, as it can turn into butter.
Prepare the Pastry Cream: Bring the milk, 1/4 cup sugar, the vanilla bean and its seeds, and salt to a simmer in a medium saucepan over medium heat.
In a medium bowl, whisk the egg yolks and remaining 1/4 cup sugar together until pale and slightly thickened. Whisk in the cornstarch, 1 tablespoon at a time, ensuring there are no lumps.
Gradually ladle 1/2 cup of the hot milk mixture into the yolk mixture, whisking constantly to temper the eggs and prevent them from scrambling. Add the remaining milk mixture, 1/2 cup at a time, whisking continuously.
Pour the mixture back into the saucepan. Heat, whisking constantly, until the mixture comes to a simmer and has thickened, about 2 minutes. Discard the vanilla bean.
Transfer the mixture to the bowl of an electric mixer fitted with the paddle attachment. Add the butter and mix on medium speed until the butter has melted and the mixture has cooled slightly, about 5 minutes.
Remove the bowl and press plastic wrap directly onto the surface of the pastry cream to prevent a skin from forming. Refrigerate until cold, at least 2 hours (up to 2 days).
Assemble the Cake:
Put the pastry cream into the clean, dry bowl of an electric mixer fitted with the whisk attachment. Beat on medium-low speed until smooth and lightened.
Trim the tops of the cakes to be flat, if necessary. Carefully halve each cake horizontally, creating four layers.
Place 1 layer on a cake plate and brush the top generously with the rum syrup. Spread with half of the pastry cream.
Top with the second cake layer, brush with syrup, and spread with a 1/4-inch-thick layer of whipped cream.
Top with the third cake layer. Brush with syrup, then spread with the remaining pastry cream.
Top with the final cake layer and brush with syrup.
Insert a wooden skewer through the center of the cake to hold the layers together. Using kitchen shears, cut the skewer flush with the top of the cake.
Spread whipped cream all over the top and sides of the cake, creating a smooth, even coating.
Refrigerate for 1 to 4 hours to allow the cake to set and the flavors to meld.
Decorate the cake plate with leaves, if desired. Discard the skewer after slicing the cake.

Expert Tips & Tricks

Perfecting the Genoise: The key to a light and airy Genoise is incorporating air. Ensure your eggs are at room temperature, as they will whip up more easily. Be gentle when folding in the flour and butter to avoid deflating the batter.
Flavor Infusions: Experiment with the rum syrup by adding a vanilla bean or citrus zest during simmering. This will add depth and complexity to the cake’s flavor.
Make-Ahead Tip: The pastry cream can be made up to 2 days in advance. Store it in the refrigerator, covered with plastic wrap pressed directly onto the surface to prevent a skin from forming.
Preventing a Soggy Cake: Don’t over-saturate the cake layers with syrup. Brush it on gently and evenly, allowing the cake to absorb it gradually.

Serving & Storage Suggestions

Serve the Genoise cake chilled. It’s best enjoyed within 2-3 days of assembly. Store leftovers in the refrigerator, tightly covered, to prevent them from drying out. The cake can be frozen for longer storage, but the texture of the whipped cream may change slightly upon thawing. Thaw the cake in the refrigerator overnight before serving.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	669 kcal	N/A
Total Fat	38 g	58%
Saturated Fat	22.1 g	110%
Cholesterol	315.4 mg	105%
Sodium	127.7 mg	5%
Total Carbohydrate	72.7 g	24%
Dietary Fiber	0.3 g	1%
Sugars	54.8 g	N/A
Protein	9.8 g	19%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

Non-Alcoholic Version: Omit the rum from the syrup and replace it with vanilla extract or almond extract for a kid-friendly version.
Citrus Twist: Add lemon or orange zest to the cake batter and syrup for a refreshing citrus flavor.
Chocolate Genoise: Replace some of the cake flour with cocoa powder for a chocolatey cake.
Berry Filling: Substitute the pastry cream with a layer of fresh berries and a light berry compote for a summery variation.

FAQs (Frequently Asked Questions)

Q: Can I make this cake a day ahead?
A: Yes! The cake can be assembled a day in advance and stored in the refrigerator. This allows the flavors to meld together even more beautifully.

Q: What’s the best way to prevent the cake layers from drying out?
A: Generously brush the cake layers with the rum syrup to keep them moist. Also, ensure the assembled cake is tightly covered and refrigerated.

Q: Can I use store-bought pastry cream?
A: While homemade pastry cream is highly recommended for the best flavor and texture, you can use store-bought pastry cream in a pinch. Just make sure to beat it until smooth before using.

Q: What if I don’t have cake flour?
A: You can make a substitute for cake flour by using all-purpose flour. For every cup of all-purpose flour, remove 2 tablespoons and replace them with 2 tablespoons of cornstarch.

Q: How do I prevent my whipped cream from separating?
A: Ensure your bowl and whisk are cold before whipping the cream. Also, don’t overwhip the cream. Stop beating when medium peaks form.

Final Thoughts

This Genoise Layer Cake with Rum Syrup and Whipped Cream Frosting isn’t just a recipe; it’s an invitation to create a memorable experience. The delicate crumb of the cake, the intoxicating aroma of rum, and the ethereal lightness of the whipped cream come together in a symphony of flavors and textures. Don’t be intimidated by the multiple steps – each component is relatively simple, and the final result is well worth the effort. So, gather your ingredients, put on some music, and embark on this culinary adventure. Share your creations and feedback, and consider pairing this delightful cake with a cup of strong coffee or a glass of dessert wine. Enjoy!

Genoise Layer Cake With Rum Syrup and Whipped Cream Frosting Recipe