Dulce Castella is a luscious twist on the classic Japanese kasutera, a honey-sweetened sponge cake with a fine, velvety crumb. This version adds rich dulce de leche for a caramel depth that pairs beautifully with the cake’s naturally tender texture. The technique of warming the egg mixture and folding in flour creates a stable foam, resulting in a cake that is moist, delicate, and irresistibly soft.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), room temperature
- 1 cup (200 g) granulated sugar
- 3 tbsp (60 g) honey
- 1 cup (120 g) cake flour, sifted
- 1/4 cup (60 ml) whole milk, warm
- 2 tbsp (30 g) unsalted butter, melted and cooled
- 1/2 cup (160 g) dulce de leche, at room temperature
- 1 tsp vanilla extract
- Pinch of salt
Instructions
- Preheat your oven to 325°F (163°C). Line a 9-inch (23 cm) round cake pan with parchment paper on the bottom and sides. If using a springform pan, wrap the outside with aluminum foil to prevent water seepage.
- In a large heatproof bowl, combine the eggs, sugar, and honey. Place the bowl over a pot of simmering water (make sure the bottom doesn’t touch the water). Whisk constantly until the mixture is warm to the touch, about 110°F (43°C), and the sugar has dissolved. This should take about 3–4 minutes.
- Remove the bowl from the heat. Using a hand mixer or stand mixer with the whisk attachment, beat the egg mixture on high speed until it becomes thick, pale, and triples in volume. When you lift the whisk, the batter should fall in a thick ribbon that holds its shape for a few seconds. This takes about 5–7 minutes.
- In a small bowl, stir together the warm milk, melted butter, vanilla, and a pinch of salt. Set aside.
- Sift the cake flour over the beaten eggs in three additions, gently folding with a spatula after each addition. Fold until no streaks of flour remain, being careful not to deflate the batter.
- Take about 1 cup of the batter and mix it into the milk-butter mixture until smooth. Then pour this mixture back into the main batter and fold gently until just combined.
- Pour the batter into the prepared pan. Tap the pan on the counter a few times to release large air bubbles. Drizzle the dulce de leche over the top and use a knife to gently swirl it into the batter, creating a marbled effect.
- Place the cake pan inside a larger roasting pan. Pour hot water into the roasting pan until it reaches about 1 inch (2.5 cm) up the sides of the cake pan. This water bath helps the cake bake evenly and stay moist.
- Bake for 50–60 minutes, until the top is golden brown and a toothpick inserted into the center comes out clean or with just a few moist crumbs. The internal temperature of the cake should read about 200°F (93°C) if you want to check with a thermometer.
- Turn off the oven and leave the cake inside with the door slightly ajar for 10 minutes. Then remove the cake from the water bath and let it cool in the pan on a wire rack for 15 minutes. Carefully remove from the pan and peel off the parchment. Let cool completely before slicing.
Tips
- Room temperature eggs are crucial for maximum volume when beating. If you forgot to take them out, place them in a bowl of warm water for 5 minutes.
- Do not overmix after adding the flour. Overmixing deflates the air and makes the cake dense. Fold just until the flour is incorporated.
- Use cake flour for the softest crumb. If you don’t have it, substitute with all-purpose flour minus 2 tablespoons per cup, then sift several times.
- If the top browns too quickly, tent the cake loosely with aluminum foil halfway through baking.
Serving Suggestions
Serve dulce castella at room temperature with a dusting of powdered sugar or a drizzle of extra dulce de leche. It pairs wonderfully with a cup of coffee, black tea, or a glass of cold milk. For a dessert, serve with a scoop of vanilla ice cream or lightly sweetened whipped cream and fresh berries.
Variations
- Chocolate Dulce Castella: Replace 2 tablespoons of cake flour with unsweetened cocoa powder. Add 1/4 cup (60 g) of chocolate chips to the batter if desired.
- Citrus Castella: Add 1 tablespoon of orange or lemon zest to the batter along with the vanilla. Omit the dulce de leche and instead brush the baked cake with a simple syrup made from equal parts sugar and citrus juice.
- Matcha Castella: Add 1 tablespoon of matcha powder to the cake flour before sifting. Skip the dulce de leche swirl and keep the cake plain.
- Mini Cakes: Bake in muffin tins or small ramekins for individual portions. Reduce baking time to 25–30 minutes.
Storage and Reheating
Store leftover dulce castella in an airtight container at room temperature for up to 2 days, or in the refrigerator for up to 5 days. The cake actually tastes even better the next day as the flavors meld. To freeze, wrap the cake tightly in plastic wrap and then foil; it will keep for up to 3 months. Thaw overnight in the refrigerator before serving. To reheat, microwave a slice for 10–15 seconds until just warm, or warm in a 300°F (150°C) oven for 5–7 minutes.
Frequently Asked Questions
Why did my cake collapse after baking?
This usually happens if the cake was underbaked or if the batter was overmixed, which deflated the air. Make sure to bake until a toothpick comes out clean and the cake feels firm to the touch. Also, avoid opening the oven door during the first 30 minutes of baking.
Can I make this without a water bath?
Yes, but the texture will be less moist and the cake may dome more. The water bath provides steam and gentle heat, which is key to the cake’s soft, even crumb. If you skip it, reduce the oven temperature to 300°F (150°C) and bake for about 55–65 minutes.
Can I use store-bought dulce de leche?
Absolutely. Look for it in the international aisle or near the ice cream toppings. If it’s too thick to drizzle, warm it slightly with a splash of milk to thin it out.
Why is my cake dense and rubbery?
This often happens when the eggs are not beaten enough, or when the flour is overmixed. Beat the eggs until they reach the ribbon stage, and fold the flour very gently. Also, make sure your oven is not too hot, which can cause the cake to set too quickly.
Can I substitute honey with something else?
Yes, you can use maple syrup or corn syrup, but the flavor will change slightly. Honey adds a distinct floral note that is traditional in castella. If using liquid sweetener, reduce the sugar by 2 tablespoons to balance moisture.
How do I know when the cake is done?
Insert a toothpick into the center; it should come out clean or with a few moist crumbs. The top should be golden brown and spring back when lightly pressed. An internal temperature of 200°F (93°C) is a reliable indicator.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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