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Ambrosia Layer Cake: A Slice of Southern Sunshine

The scent of citrus always transports me back to my grandmother’s kitchen in Savannah. On sweltering summer afternoons, the air would be thick with humidity and the sweet, tangy aroma of oranges and lemons. She’d be humming a gospel tune, her hands dusted with flour as she meticulously assembled her famous Ambrosia Layer Cake. It wasn’t just a dessert; it was a symbol of her love, a centerpiece for family gatherings filled with laughter and stories. Even now, decades later, one bite of this cake can instantly bring me back to that sun-drenched kitchen, the taste a perfect blend of nostalgia and pure, unadulterated joy.

Recipe Overview

Prep Time: 1 hour
Cook Time: 25 minutes
Total Time: 2 hours
Servings: 10-12
Yield: 1 cake
Dietary Type: Not Gluten-Free

Ingredients

For the Cake:

2 ¾ cups cake flour (not self-rising, sift before measuring)
2 ½ teaspoons baking powder
½ teaspoon salt
¾ cup unsalted butter, softened
1 ½ cups sugar
4 large whole eggs, at room temperature for 30 minutes
1 tablespoon fresh orange zest, finely grated
1 ½ teaspoons vanilla
1 cup whole milk

For the Orange Filling:

2 large eggs
¾ cup sugar
¼ cup cornstarch
¾ cup water
½ cup fresh orange juice
¼ cup fresh lemon juice
3 tablespoons unsalted butter
2 teaspoons orange zest, finely grated

For the Seven-Minute Frosting:

1 (7 ounce) bag sweetened flaked coconut (2 ⅔ cups)
2 large egg whites
1 cup sugar
¼ cup water
2 teaspoons light corn syrup
1 teaspoon vanilla
1 teaspoon fresh lemon juice

Equipment Needed

Electric mixer (stand or handheld)
3 9-inch cake pans
Parchment paper rounds
Serrated knife
Heatproof bowl
Whisk
Saucepan
Shallow baking pan

Instructions

Position an oven rack in the middle and preheat the oven to 350°F (175°C). Thoroughly butter and flour three 9-inch cake pans, tapping out any excess flour. Lining the bottoms of the pans with parchment paper rounds can ensure even easier release.
In a medium bowl, sift together the 2 ¾ cups of cake flour, 2 ½ teaspoons of baking powder, and ½ teaspoon of salt. Sifting is crucial for a light and airy cake.
In a large bowl, using an electric mixer (fitted with the paddle attachment if using a stand mixer), beat together the ¾ cup of softened butter and 1 ½ cups of sugar at medium-high speed until the mixture is pale and fluffy, about 3 to 5 minutes. This creaming process incorporates air, contributing to the cake’s texture.
Beat in the 4 large eggs one at a time, ensuring each egg is fully incorporated before adding the next. Then, beat in the 1 tablespoon of orange zest and 1 ½ teaspoons of vanilla. Continue beating for 5 minutes more to develop the batter’s structure.
Reduce the mixer speed to low. Add the flour mixture and 1 cup of milk alternately in 4 batches, beginning and ending with the flour mixture. Mix until the batter is just smooth. Be careful not to overmix, as this can develop the gluten in the flour and result in a tough cake.
Divide the batter evenly between the prepared cake pans, spreading it evenly with a spatula.
Bake the cake layers until they begin to pull away from the sides of the pans and a wooden pick or skewer inserted into the center comes out clean, about 20 to 25 minutes. Check for doneness starting at 20 minutes to avoid overbaking.
Cool the cakes in the pans on wire racks for 5 minutes. Then, invert the cake layers onto the racks and cool completely before frosting. Leaving the oven on, reduce temperature to 325°F (160°C) to prepare for toasting the coconut.
While the cake layers are baking, prepare the orange filling.
In a heatproof bowl, whisk together the 2 large eggs until well combined.
In a 1 ½- to 2-quart heavy saucepan, whisk together the ¾ cup of sugar, ¼ cup of cornstarch, and a pinch of salt. Then, whisk in the ¾ cup of water, ½ cup of orange juice, and ¼ cup of lemon juice until smooth.
Bring the mixture to a boil over moderate heat, whisking constantly. Then, reduce the heat to low and cook at a bare simmer, whisking constantly, for 2 minutes. The mixture will thicken considerably.
Temper the eggs by slowly adding half of the hot juice mixture to the eggs in a slow stream, whisking constantly to prevent the eggs from scrambling.
Whisk the egg mixture back into the remaining juices in the saucepan and cook over moderately low heat, whisking constantly, just until it reaches a boil.
Remove the pan from the heat and add the 3 tablespoons of butter and 2 teaspoons of orange zest, whisking until the butter is melted and the filling is smooth.
Chill the filling, covering its surface with a buttered round of wax paper (buttered side down) to prevent a skin from forming, until cold, about 30 minutes.
Prepare the seven-minute frosting.
Spread the 2 ⅔ cups of coconut in a shallow baking pan and toast in the preheated oven (325°F / 160°C), stirring occasionally, until golden brown, about 12 to 15 minutes. Watch carefully to prevent burning.
In a large metal bowl, beat together the 2 large egg whites, 1 cup of sugar, ¼ cup of water, 2 teaspoons of light corn syrup, and a pinch of salt with a handheld electric mixer until combined.
Set the bowl over a saucepan of simmering water (making sure the bowl doesn’t touch the water) and beat the mixture at high speed until it holds stiff, glossy peaks, about 5 to 7 minutes. Humid weather may necessitate additional beating time.
Remove the bowl from the heat and add the 1 teaspoon of vanilla and 1 teaspoon of lemon juice. Continue beating until the frosting is cooled and very thick, about 6 to 10 minutes.
Assemble the cake. Using a long serrated knife, halve each cake layer horizontally.
Place one layer on a cake stand or large plate and spread with about ¾ cup of the orange filling. Stack the remaining cake layers, using about ¾ cup of filling between each layer.
Spread the top and sides of the cake with the seven-minute frosting and coat the cake with the toasted coconut, gently pressing it to help it adhere.

Expert Tips & Tricks

For a more intense orange flavor, consider adding a tablespoon of orange liqueur to the filling.
If you don’t have cake flour, you can make your own by removing 2 tablespoons of all-purpose flour per cup and replacing it with cornstarch.
Make sure your eggs are truly at room temperature for the best volume when whipping. You can speed this up by placing them in a bowl of warm water for a few minutes.
If your frosting doesn’t thicken properly, try adding a pinch of cream of tartar.

Serving & Storage Suggestions

Serve the Ambrosia Layer Cake chilled or at room temperature. It’s best enjoyed within 2-3 days of assembly, as the frosting can begin to weep after that. Store leftover cake in an airtight container in the refrigerator. While freezing is not recommended due to the frosting’s texture, individual slices can be frozen for up to a month if tightly wrapped.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	730 kcal	37%
Total Fat	28 g	43%
Saturated Fat	19 g	95%
Cholesterol	175 mg	58%
Sodium	327 mg	14%
Total Carbohydrate	112 g	38%
Dietary Fiber	2 g	7%
Sugars	77 g	308%
Protein	9 g	18%

Variations & Substitutions

Gluten-Free: Substitute the cake flour with a gluten-free blend. Be sure to add xanthan gum if the blend doesn’t already contain it.
Citrus Medley: Add grapefruit or tangerine zest to both the cake and the filling for a more complex citrus profile.
Tropical Twist: Replace half of the whole milk in the cake with coconut milk and fold in a cup of crushed pineapple into the filling.
Nutty Delight: Add a layer of toasted pecans or walnuts between the cake layers for added texture and flavor.

FAQs (Frequently Asked Questions)

Q: Can I make the cake layers ahead of time?

A: Absolutely! The cake layers (not split horizontally) can be made up to 3 days ahead and chilled, wrapped individually in plastic wrap.

Q: How long can I chill the orange filling?

A: The filling can be chilled for up to 8 hours. Stir it well before spreading.

Q: Can I make the seven-minute frosting in advance?

A: Yes, the frosting can be made up to 4 hours ahead and chilled, covered.

Q: My frosting is not stiffening up, what should I do?

A: Ensure your bowl and beaters are completely clean and dry. Continue beating the frosting over the simmering water for a longer period. A pinch of cream of tartar can also help stabilize the egg whites.

Q: Can I use store-bought orange juice instead of fresh?

A: Freshly squeezed orange juice will provide a brighter, more vibrant flavor. However, if you are short on time, you can use a high-quality, pulp-free store-bought orange juice.

Final Thoughts

This Ambrosia Layer Cake is more than just a recipe; it’s an invitation to create memories. Don’t be intimidated by the multiple steps – each one contributes to the overall symphony of flavors and textures. Gather your ingredients, embrace the process, and prepare to be transported to a sun-drenched afternoon, where the aroma of citrus fills the air and every bite is a taste of pure joy. I encourage you to try this recipe and share your experiences with me! Perhaps a glass of sweet tea or a crisp Sauvignon Blanc would be the perfect accompaniment. Happy baking!

Ambrosia Layer Cake Recipe