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Fluffy Japanese Sponge Cake Recipe | Soft & Airy Castella Cake
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Learn how to make a fluffy Japanese sponge cake with this easy step-by-step recipe. Light, airy, and perfectly soft—just like bakery-style Castella cake.
🍰 Fluffy Japanese Sponge Cake – The Ultimate Light & Airy Dessert
If you’ve ever tasted a Japanese sponge cake, you know how incredibly soft, jiggly, and cloud-like it is. This fluffy Japanese sponge cake recipe (also known as Castella-style cake) delivers a delicate texture that melts in your mouth.
Perfect for tea time, celebrations, or as a base for layered cakes, this recipe is simple yet elegant—and once you master it, you’ll never go back to regular sponge cake.
🌟 Why You’ll Love This Japanese Sponge Cake
• ☁️ Ultra soft and airy texture
• 🍰 Light, not overly sweet
• 🎂 Perfect for layering or serving plain
• 🧁 Made with simple pantry ingredients
• 🇯🇵 Authentic bakery-style results at home
🧾 Ingredients
• 6 large eggs (separated into whites and yolks)
• 2/3 cup (80g) cake flour (sifted)
• 1/3 cup (70g) vegetable oil
• 1/3 cup (80ml) milk
• 1/2 cup (100g) granulated sugar
• 1 tsp vanilla extract
• 1/4 tsp cream of tartar (or a few drops of lemon juice)
• A pinch of salt
👨🍳 How to Make Fluffy Japanese Sponge Cake
Step 1: Prepare Your Pan & Oven
• Preheat oven to 160°C (320°F).
• Line a cake pan with parchment paper.
• Prepare a water bath (bain-marie) for even baking.
Step 2: Mix the Yolks Batter
• In a bowl, whisk egg yolks with vegetable oil, milk, and vanilla extract.
• Add sifted cake flour and mix until smooth and lump-free.
Step 3: Make the Meringue
• In a clean bowl, beat egg whites with salt.
• Add cream of tartar (or lemon juice).
• Gradually add sugar while beating until soft peaks form.
👉 This step is key to achieving that signature fluffy texture.
Step 4: Fold Gently
• Add one-third of the meringue into the yolk mixture and mix gently.
• Fold in the remaining meringue in batches using a spatula.
• Be careful not to deflate the batter.
Step 5: Bake to Perfection
• Pour the batter into the prepared pan.
• Tap lightly to remove air bubbles.
• Place in a water bath and bake for 60–70 minutes.
Step 6: Cool & Serve
• Let the cake cool gradually inside the oven with the door slightly open.
• Remove, slice, and enjoy your soft, airy sponge cake.
🔥 Pro Tips for a Perfect Fluffy Cake
• Use room-temperature eggs for better volume
• Do not overmix after adding meringue
• Bake at low temperature for even rise
• Always use a water bath to prevent cracking
• Avoid opening the oven early
🍓 Serving Ideas
This fluffy Japanese sponge cake pairs beautifully with:
• Fresh strawberries and whipped cream 🍓
• Powdered sugar dusting ❄️
• Light fruit compote 🍑
• Matcha cream for a Japanese twist 🍵
❓ Common Mistakes to Avoid
• Overbeating egg whites (leads to dry texture)
• Skipping the water bath
• Using all-purpose flour instead of cake flour
• Mixing too aggressively
⭐ Final Thoughts
This fluffy Japanese sponge cake is the definition of light, delicate, and perfectly balanced sweetness. Whether you’re baking for guests or simply treating yourself, this recipe guarantees bakery-quality results at home.
Once you master this technique, you can easily turn it into layered cakes, roll cakes, or even creative desserts.
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