If you’ve ever wanted to indulge in a slice of delicate, moist sweetness with a beautiful honey aroma, then you’re in for a treat with this Japanese Castella Cake (Kasutera) Recipe. This legendary sponge cake, with its tender crumb and gentle golden color, brings a little bit of Japan’s charming tea time right into your kitchen. It’s not just a cake; it’s an experience in every bite, showcasing the harmony of simple ingredients transformed through patience and care into a fluffy masterpiece that will leave you smiling.
Ingredients You'll Need
One of the most delightful parts of making this Japanese Castella Cake (Kasutera) Recipe is how few ingredients it calls for, yet each is so crucial for achieving that signature texture and flavor. From the honey's subtle sweetness to the perfect combination of flours that build the cake’s structure, these ingredients work beautifully together.
- Coarse sugar (turbinado or similar): Sprinkled in the pan to add a subtle caramelized crunch to the crust.
- Bread flour: Provides the necessary gluten strength for that firm yet tender cake body.
- Cake flour: Keeps the crumb soft and delicate by lowering gluten content.
- Egg whites: Whipped into a meringue for essential lift and lightness.
- White caster sugar: Sweetens the meringue smoothly without graininess.
- Egg yolks: Contribute richness and color to the batter.
- Honey: Adds a fragrant floral sweetness that defines this castella.
- Whole milk: Moisturizes the batter, helping produce a tender crumb.
- Neutral cooking oil (canola works great): Keeps the cake moist and soft without overpowering flavors.
How to Make Japanese Castella Cake (Kasutera) Recipe
Step 1: Preparing Your Ingredients and Pan
Begin by gathering and measuring everything out. Separate the egg whites and yolks into separate bowls and allow them to reach room temperature, which is key for whipping the whites to the perfect volume. Line an 18cm square cake pan with baking paper, making sure the edges overlap slightly, and sprinkle the coarse sugar evenly over the bottom—this little step adds a unique texture to the final cake crust.
Step 2: Preheat and Sift Flours
Get your oven warmed up to 180°C (356°F) early, so it’s ready to bake as soon as the batter is made. Sift the bread flour and cake flour together to ensure there are no lumps and a light, even consistency which will contribute to the cake’s famously fine crumb.
Step 3: Whip the Egg Whites
Pour the egg whites into a clean, dry bowl and start whipping them on a low to medium-low speed until foamy and they've at least doubled in size. Gradually sprinkle the white caster sugar in small additions, making sure it dissolves completely between each addition. Increase the mixer speed to medium or medium-high and continue whipping until you get stiff, shiny peaks that stand tall with confidence.
Step 4: Incorporate Egg Yolks and Honey
Add the egg yolks one at a time, whipping briefly after each addition to integrate them fully without deflating your beautiful meringue. Then gently drizzle in the honey and whip just a bit more—this is the magic moment where the cake’s signature fragrance begins to build.
Step 5: Fold in Flour
Sift the flour mixture into the batter in three parts, folding delicately with a spatula after each addition. This gentle folding keeps the air bubbles intact, which are vital for the airy texture of your castella.
Step 6: Mix Oil and Milk, Then Combine
In a small bowl, whisk the whole milk with the cooking oil. Take about two to three tablespoons of your batter and combine it with this milk-oil mix to temper it. Then fold this mixture back into the main batter carefully to maintain smoothness and volume.
Step 7: Prepare for Baking
Pour the batter into your prepared cake pan. Using a bamboo skewer, create gentle zigzag lines across the batter surface both horizontally and vertically three times, then drop the pan sharply a couple of times onto the counter to release air bubbles. Place the pan on the top oven rack and bake for a minute.
Step 8: Repeating the Skewer Lines and Continue Baking
Remove the cake and repeat the zigzag line process two more times, baking on the top rack for another minute each time, smoothing the surface afterwards. Then lower the oven temperature to 160°C (320°F), move the pan to the middle shelf, and bake for 28 to 35 minutes. Your cake is ready when a skewer inserted comes out clean. Drop the pan on the counter again to prevent shrinking.
Step 9: Cooling and Resting the Cake
Carefully remove the cake from the pan while still wrapped in baking paper, and cover it tightly with plastic wrap. Place it upside down in a large, airtight container to rest for 12 to 24 hours. This resting period is what develops castella’s soft texture and moist crumb. If your kitchen is warm, let the cake cool to room temperature before refrigerating.
Step 10: Trimming and Slicing
Once rested, unwrap and carefully trim the crust from the edges, then slice the cake with a sharp knife into thick, clean pieces by wiping the blade between cuts. This finishing touch yields the classic presentation of Japanese Castella Cake (Kasutera) you know and love.
How to Serve Japanese Castella Cake (Kasutera) Recipe
Garnishes
A simple dusting of powdered sugar or a drizzle of honey can elevate your castella slices. You might also try a smear of whipped cream or a dollop of sweet red bean paste for an authentic Japanese touch that complements the cake’s honey notes perfectly.
Side Dishes
This cake is fantastic alongside a cup of green tea or matcha, balancing the sweetness beautifully. Fresh seasonal fruits, like berries or sliced citrus, add a refreshing counterpoint that makes teatime even more delightful.
Creative Ways to Present
For a fun twist, use Japanese Castella Cake (Kasutera) Recipe as a base for layered desserts. Cube it and layer it with cream and fruit in parfait glasses, or soak slices lightly in syrup for a castella-based tiramisu. Its light texture makes it incredibly versatile and perfect for culinary creativity.
Make Ahead and Storage
Storing Leftovers
Keep any leftover castella tightly wrapped in plastic wrap at room temperature or in the refrigerator to preserve its moisture. Stored properly, it stays fresh for up to three days, maintaining that lovely softness you baked it for.
Freezing
You can freeze Japanese Castella Cake (Kasutera) Recipe slices by wrapping them individually in plastic wrap and placing them in an airtight container or freezer bag. When you’re ready, thaw slices overnight in the fridge for a moist, fresh-tasting treat anytime.
Reheating
To bring a frozen or refrigerated slice back to life, warm it gently in a microwave for 10–15 seconds or at low heat in an oven. This will revive the cake’s soft texture and enhance its honey aroma, making it feel freshly baked again.
FAQs
What makes Japanese Castella Cake different from other sponge cakes?
Japanese Castella Cake stands out due to its use of honey, the combination of bread and cake flours, and its unique steaming and resting process. These steps give it a moist yet firm texture and a subtle sweetness that is deeply satisfying.
Can I substitute ingredients in this Japanese Castella Cake (Kasutera) Recipe?
While the recipe relies on specific flours and honey for texture and flavor, you can experiment carefully. For example, using a similar clear honey or swapping oils within neutral options won’t drastically alter the outcome, but sticking to the recommended flours keeps the best texture.
Why is the resting period important?
Resting the cake wrapped and upside down allows moisture to redistribute evenly, preventing it from drying out or shrinking. It’s a key step that results in the signature moist and tender crumb of this cake.
Can I use electric beaters or a stand mixer to whisk the egg whites?
Absolutely! A stand mixer or electric beaters are perfect for achieving the stiff peak meringue quickly and efficiently. Just make sure your mixing bowl and beaters are clean and dry to get the best volume.
How long will this cake keep fresh if stored properly?
When wrapped well and stored at room temperature or refrigerated, Japanese Castella Cake will stay fresh for about 2 to 3 days. For longer keeping, freezing is recommended.
Final Thoughts
This Japanese Castella Cake (Kasutera) Recipe is such a heartwarming treat to make and share. Its delicate crumb and subtle honey sweetness connect you to a centuries-old tradition, and each step invites you to slow down and enjoy the process. I promise that once you try it, this lovely cake will become a treasured favorite in your baking repertoire. So why wait? Whip up a batch and savor the sweet simplicity of this wonderful cake today!
Print
Japanese Castella Cake (Kasutera) Recipe
- Prep Time: 20 minutes
- Cook Time: 35 minutes
- Total Time: 24 hours 55 minutes
- Yield: 16 servings
- Category: Dessert
- Method: Baking
- Cuisine: Japanese
Description
Japanese Castella Cake (Kasutera) is a delicate, moist sponge cake known for its fine texture and subtle sweetness. Made with a blend of bread and cake flours and sweetened with honey and caster sugar, this traditional cake requires careful folding and multiple bakes to achieve its signature light and airy crumb. Resting the cake for 24 hours enhances its flavor and moistness, making it a perfect treat for tea time or dessert.
Ingredients
For the Cake Batter
- 1 tbsp coarse sugar (turbinado or similar)
- 100 g bread flour
- 20 g cake flour
- 3 egg whites (approx 35g/1.25oz each)
- 120 g white caster sugar
- 4 egg yolks (approx 17g/0.6oz each)
- 40 g honey
- 30 ml whole milk
- 30 ml cooking oil (neutral oil like canola)
Instructions
- Prepare Ingredients and Pan: Measure out all ingredients. Separate egg yolks and whites into different bowls. Cover and bring them to room temperature. Line an 18cm (7") square cake pan with baking paper, allowing edges to overlap slightly. Sprinkle 1 tablespoon coarse sugar evenly over the baking paper and set aside.
- Preheat Oven and Sift Flours: Preheat oven to 180 °C (356 °F). Sift 100 g bread flour and 20 g cake flour together into a bowl and set aside.
- Make Meringue: Pour 3 egg whites into a clean, dry bowl and whip at low/medium-low speed until foamy and doubled. Gradually add 120 g caster sugar in 3 to 4 additions, ensuring each is fully incorporated before adding more. Scrape down bowl sides often.
- Whip to Stiff Peaks: Increase the mixer speed to medium/medium-high and whip the meringue until stiff peaks form that stand straight up without collapsing.
- Incorporate Egg Yolks: Add 4 egg yolks one at a time, whipping for 5-10 seconds after each addition to combine well.
- Add Honey: Drizzle in 40 g honey and whip for another 10 seconds before switching to folding with a spatula.
- Fold in Flours: Sift the flour mixture over the batter one-third at a time and gently fold in with a spatula, preserving as much air as possible.
- Incorporate Milk and Oil: In a small bowl, whisk 30 ml whole milk and 30 ml cooking oil together. Transfer 2-3 tablespoon of the cake batter into this bowl and whisk until incorporated, then pour back into the main batter. Gently fold until smooth and thick.
- Prepare Batter in Pan: Pour the batter into the lined pan. Use a bamboo skewer to draw zigzag lines across the surface in both directions three times to remove big air bubbles. Drop the pan on the counter to further release trapped air.
- Initial Baking: Place the pan on the top shelf of the oven and bake for 1 minute.
- Repeat Skewer Lines and Bake: Remove the cake, repeat drawing lines with the skewer in both directions three times. Smooth lumps, move the pan to the middle shelf, reduce oven temperature to 160 °C (320 °F), and bake for 28-35 minutes.
- Check Doneness: Start checking around 25 minutes with a skewer; it’s done when it comes out clean. Once baked, drop the cake pan on the counter to prevent shrinkage. Let it cool a few minutes, then carefully remove the cake from the pan.
- Wrap and Rest: While still warm, wrap the cake in the baking paper with plastic wrap without removing the paper. Place it upside-down inside a large airtight container and rest for 24 hours. In hot climates, cool to room temperature and refrigerate.
- Trim Edges: After 12-24 hours resting, unwrap the cake and trim edges cleanly.
- Slice and Serve: Cut the cake in half, then slice each half into thick slices. Use a sharp knife and wipe it between each cut for neat slices. Serve and enjoy the light, moist castella cake.
Notes
- Resting the castella cake for 24 hours is essential to develop its characteristic moistness and flavor.
- Using both bread flour and cake flour provides the perfect balance of structure and tenderness.
- Folding gently helps retain air bubbles and ensures the cake remains light.
- Drawing the zigzag lines with a bamboo skewer helps release large air bubbles, preventing holes in the cake.
- Castella is traditionally enjoyed plain but can be served with tea or fresh fruit.
- Ensure eggs and other ingredients are at room temperature for best volume and texture.
- Use a sharp knife wiped clean between cuts to get smooth slices without crumbling.
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