Orange castella cake is a light, airy Japanese sponge cake with a delicate honey and orange flavor. It has a distinctive fine crumb and a bouncy, moist texture that sets it apart from other sponges. This recipe uses a hot milk and butter mixture to create a smooth, tender batter that bakes into a beautifully tall, sliceable cake.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), separated, at room temperature
- 1/2 cup (100 g) granulated sugar, divided
- 1/2 cup (120 ml) whole milk
- 1/4 cup (60 g) unsalted butter, cut into pieces
- 1 tablespoon honey
- 1 tablespoon orange zest (from about 1 large orange)
- 2 tablespoons fresh orange juice
- 1 cup (120 g) cake flour, sifted
- 1/4 teaspoon salt
- 1/2 teaspoon cream of tartar (optional, for stability)
Instructions
- Preheat the oven to 325°F (165°C). Line the bottom and sides of a 9-inch (23 cm) round cake pan with parchment paper. If using a springform pan, wrap the outside with a double layer of aluminum foil to prevent water from seeping in during the water bath.
- In a small saucepan, combine the milk, butter, honey, orange zest, and orange juice. Heat over medium-low, stirring occasionally, until the butter is melted and the mixture is hot but not boiling (about 160°F / 71°C). Remove from heat and set aside.
- In a large bowl, whisk the egg yolks with half of the sugar (about 1/4 cup / 50 g) until pale and slightly thickened, about 2 minutes. Gradually pour the warm milk mixture into the yolks, whisking constantly to temper them. Add the sifted cake flour and salt, and whisk until just combined—do not overmix.
- In a separate clean, dry bowl, beat the egg whites with the cream of tartar (if using) on medium speed until foamy. Gradually add the remaining 1/4 cup (50 g) sugar, a spoonful at a time, and continue beating until stiff, glossy peaks form. The meringue should be firm but not dry.
- Gently fold one-third of the meringue into the yolk mixture to lighten it. Then fold in the remaining meringue in two additions, using a spatula. Fold just until no white streaks remain—be careful not to deflate the batter.
- Pour the batter into the prepared pan. Tap the pan gently on the counter to release any large air bubbles. Place the cake pan into a larger roasting pan. Pour hot water (not boiling) into the roasting pan until it reaches about 1 inch (2.5 cm) up the sides of the cake pan.
- Bake for 45–50 minutes, until the cake is golden brown on top and a skewer inserted into the center comes out clean. The internal temperature of the cake should read about 200°F (93°C) if measured with a thermometer, but the skewer test is most reliable.
- Remove the cake pan from the water bath and let it cool in the pan on a wire rack for 10 minutes. Then carefully invert the cake onto a cooling rack, remove the parchment, and let it cool completely, right side up.
Tips
- Room temperature eggs: Cold eggs are harder to separate and don’t whip as well. Let them sit out for 30 minutes before starting.
- Don’t overmix the batter: Once you add the flour, mix just until combined. Overmixing develops gluten, which will make the cake tough instead of tender.
- Water bath is key: The steam from the hot water keeps the cake moist and helps it rise evenly. If you skip it, the cake may be drier and could crack on top.
- Cool upside down: To prevent the cake from sinking, some bakers cool it upside down. If you do this, make sure it’s completely cool before removing the pan.
Serving Suggestions
Serve orange castella cake as a light dessert or afternoon tea treat. It pairs beautifully with a cup of green tea, jasmine tea, or a simple black coffee. For a more decadent touch, dust with powdered sugar, or serve with a dollop of whipped cream and fresh berries. It’s also delicious toasted lightly and spread with a little butter or honey.
Variations
- Citrus swap: Replace the orange zest and juice with lemon or yuzu for a different citrus flavor.
- Chocolate castella: Replace 2 tablespoons of cake flour with 2 tablespoons of unsweetened cocoa powder for a chocolate version.
- Matcha castella: Add 1 tablespoon of matcha green tea powder to the flour mixture for an earthy, vibrant twist.
- Honey-free: If you prefer no honey, substitute with an equal amount of sugar or corn syrup.
Storage and Reheating
Store the cake in an airtight container at room temperature for up to 2 days, or in the refrigerator for up to 4 days. To freeze, wrap the cooled cake tightly in plastic wrap and then in foil; it will keep for up to 2 months. Thaw overnight in the refrigerator before serving. To reheat, place slices in a 300°F (150°C) oven for 5–7 minutes, or microwave for 10 seconds per slice—be careful not to overheat or the cake will dry out.
Frequently Asked Questions
Why did my castella cake collapse?
Collapsing usually happens when the meringue is under-whipped or over-folded. Make sure you beat the egg whites to stiff peaks and fold gently until just combined. Also, avoid opening the oven door during baking, as sudden temperature changes can cause the cake to sink.
Can I use all-purpose flour instead of cake flour?
Yes, but the texture will be slightly denser. For a closer match, replace 2 tablespoons of all-purpose flour with 2 tablespoons of cornstarch, and sift together twice.
Why is my cake rubbery or dense?
This is often caused by overmixing the batter after adding the flour, or by using too much flour. Measure your flour correctly by spooning it into the cup and leveling it off, and mix only until no streaks remain.
Can I make this cake without a water bath?
You can, but the texture will be less moist and the top may crack. If you skip the water bath, reduce the oven temperature to 300°F (150°C) and check for doneness a few minutes earlier.
How do I know when the cake is done?
The cake is done when a skewer inserted into the center comes out clean, and the top is golden brown. You can also check the internal temperature: it should read about 200°F (93°C).
Can I use a different size pan?
Yes, but adjust the baking time. A larger pan will produce a thinner cake that bakes faster, while a smaller pan will need more time. Keep an eye on it and use the skewer test to check doneness.
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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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