Taiwanese castella cake is a cloud-like, jiggly sponge cake made with eggs, sugar, milk, flour, and butter, known for its honey-sweet aroma and melt-in-the-mouth texture. This recipe is designed to help you avoid the common pitfalls that turn this delicate cake into a dense, sunken, or rubbery disaster. By following precise techniques and understanding the science behind each step, you’ll achieve a tall, tender, and beautifully wobbling cake that’s as impressive as it is delicious.
Ingredients
- 6 large eggs, separated (about 200 g whites, 120 g yolks)
- 1/2 cup (120 ml) whole milk
- 1/4 cup (60 ml) vegetable oil (or melted butter, cooled)
- 2/3 cup (85 g) cake flour, sifted
- 1/2 cup (100 g) granulated sugar
- 1 tablespoon (15 ml) honey
- 1/2 teaspoon vanilla extract
- 1/4 teaspoon salt
- 1 tablespoon (15 ml) lemon juice or cream of tartar (for stabilizing egg whites)
Instructions
- Prepare the pan and oven: Preheat your oven to 320°F (160°C). Line a 9×5-inch (23×13 cm) loaf pan with parchment paper, leaving overhang on the long sides for easy lifting. Place a larger baking pan (like a roasting pan) on the lower rack and fill it halfway with hot water. This water bath will keep the cake moist and prevent cracking.
- Make the egg yolk batter: In a large bowl, whisk together the egg yolks, milk, oil, honey, and vanilla until smooth. Add the sifted cake flour and salt, and whisk gently until just combined. Be careful not to overmix; a few small lumps are fine.
- Whip the egg whites: In a clean, dry bowl (preferably metal or glass), beat the egg whites with an electric mixer on medium speed until foamy. Add the lemon juice (or cream of tartar) and continue beating. Gradually add the sugar, a spoonful at a time, while beating. Increase speed to high and beat until stiff peaks form—the whites should be glossy and hold a firm peak when the whisk is lifted, but not dry or clumpy.
- Fold the mixtures: Take one-third of the beaten egg whites and fold it into the yolk batter using a rubber spatula. This lightens the batter. Gently fold in the remaining whites in two additions, using a cutting and lifting motion, rotating the bowl. Fold just until no white streaks remain. Do not overmix, or you’ll deflate the air and the cake will be dense.
- Pour and tap: Pour the batter into the prepared pan. Gently tap the pan on the counter a few times to release large air bubbles. Smooth the top with a spatula.
- Bake in a water bath: Place the loaf pan into the larger pan with hot water. The water should come about halfway up the sides of the loaf pan. Bake at 320°F (160°C) for 50 minutes, then reduce the oven temperature to 300°F (150°C) and bake for another 20 minutes. The cake is done when a skewer inserted into the center comes out clean or with just a few moist crumbs, and the top is golden brown and springy to the touch.
- Cool in the oven: Turn off the oven and leave the cake inside with the door slightly ajar (using a wooden spoon to prop it open) for 15 minutes. This gradual cooling helps prevent the cake from collapsing from sudden temperature changes.
- Cool completely: Remove the cake from the water bath and let it cool in the pan on a wire rack for 10 minutes. Then lift it out using the parchment overhang, peel off the paper, and let it cool completely on the rack. The cake will deflate slightly as it cools—that’s normal.
Tips
- Use cake flour, not all-purpose: Cake flour has lower protein, which gives a softer crumb. If you only have all-purpose, substitute 2 tablespoons of it with cornstarch (so 1/2 cup all-purpose minus 2 tbsp + 2 tbsp cornstarch).
- Don’t overmix the batter: Once you add the flour, mix only until it’s incorporated. Overmixing develops gluten, making the cake tough and rubbery—a common disaster.
- Whip egg whites to stiff but not dry: Stop beating as soon as the peaks are stiff. Overwhipped whites look curdled and lose their ability to hold air, leading to a deflated cake.
- Water bath is essential: The steam from the water bath keeps the oven humid, preventing the top from cracking and the inside from drying out. If you skip it, the cake will likely be dry and crack.
Serving Suggestions
Serve the castella cake at room temperature, sliced into thick pieces. It’s wonderful on its own with a cup of oolong tea or coffee. For a dessert, dust with powdered sugar, add a dollop of whipped cream and fresh berries, or drizzle with a little honey. In Taiwan, it’s often enjoyed as a snack any time of day.
Variations
- Matcha Castella: Replace 1 tablespoon of cake flour with 1 tablespoon of matcha powder. Sift together before adding to the yolk mixture.
- Chocolate Castella: Replace 2 tablespoons of cake flour with 2 tablespoons of unsweetened cocoa powder. You may need to add an extra tablespoon of milk to maintain the batter consistency.
- Honey Castella: Increase the honey to 2 tablespoons (30 ml) and reduce the sugar to 1/3 cup (65 g) for a stronger honey flavor.
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. Refrigeration can dry it out, so wrap it tightly in plastic wrap. To reheat, place slices in a toaster oven or regular oven at 300°F (150°C) for 5 minutes, or microwave for 10-15 seconds until just warm. The cake also freezes well for up to 1 month; wrap tightly and thaw in the refrigerator overnight.
Frequently Asked Questions
Why did my cake collapse in the middle? This is usually caused by underbaking or a sudden temperature change. Make sure to bake until a skewer comes out clean, and cool in the oven with the door ajar to let the temperature drop gradually.
Why is my cake dense and rubbery? Overmixing the batter after adding the flour develops gluten, and overwhipping the egg whites can also cause a dense texture. Fold gently and stop mixing as soon as the ingredients are combined.
Can I bake this without a water bath? You can, but the cake will likely crack on top and be less moist. If you skip it, increase the oven temperature to 330°F (165°C) and bake for 55-60 minutes, but expect a drier texture.
Why did my cake stick to the pan? Make sure to line the pan with parchment paper, leaving overhang. Also, let the cake cool for 10 minutes before lifting it out, as it’s more fragile when hot.
Can I use a different size pan? Yes, but the baking time will change. A wider pan (like a 9×13-inch) will result in a thinner cake that bakes faster—check for doneness at 40 minutes. A smaller pan will need longer.
Why is my cake too sweet? The sugar is necessary for structure and moisture, not just sweetness. You can reduce it by 1-2 tablespoons, but the texture may be slightly less tender.
Related
- Slow Cooker Beef Roast: Easy Fall-Apart Recipe
- Slow and Easy Cooking: A Complete Guide
- Slow Cooker Ham: Easy Crock Pot Recipe
More recipes to cook
Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
Spotted an error? Tell us and we will correct it (corrections policy).