Castella cake is a soft, spongy Japanese cake made from just eggs, sugar, flour, and honey. This version is inspired by the gift-wrapped castella that appears in the video game Tomodachi Life — a simple, sweet loaf that’s meant to be shared. It works beautifully because the technique is straightforward, and the result is a tender, honey-scented cake with a lovely golden crust.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), room temperature
- 1 cup (200 g) granulated sugar
- 1/4 cup (85 g) honey
- 2 tablespoons (30 ml) warm water
- 1 1/2 cups (180 g) bread flour (or all-purpose flour)
- 1/4 teaspoon salt
- Optional for gift wrapping: parchment paper, a small box, and ribbon
Instructions
- Preheat your oven to 325°F (163°C). Line a 9×5-inch (23×13 cm) loaf pan with parchment paper, leaving some overhang on the long sides for easy lifting.
- 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 gently until the sugar dissolves and the mixture feels warm to the touch, about 2–3 minutes. Remove from heat.
- Add the warm water and salt to the egg mixture. Using a hand mixer or stand mixer, beat on high speed for about 8–10 minutes, until the batter is thick, pale, and has tripled in volume. When you lift the whisk, the batter should fall in a slow ribbon that holds its shape for a few seconds.
- Sift the flour over the batter in three additions. Use a rubber spatula to fold gently after each addition, cutting through the batter and scraping the bottom to ensure no dry pockets remain. Do not overmix — stop as soon as the flour is incorporated.
- Pour the batter into the prepared pan. Tap the pan on the counter a few times to release any large air bubbles.
- Bake for 40–45 minutes, until the top is deep golden brown and a skewer inserted into the center comes out clean. If the top browns too quickly, loosely tent with foil after 25 minutes.
- Remove the cake from the oven and immediately cover the pan with plastic wrap. Let it cool completely in the pan, about 1 hour. This helps keep the crust soft and moist.
- Once cool, lift the cake out using the parchment overhang. Trim the edges if desired, then cut into thick slices. Wrap slices in parchment or cellophane and tie with ribbon for a gift.
Tips
- Use bread flour for a chewier texture: Bread flour gives castella its characteristic dense-yet-soft crumb. If you only have all-purpose, it will still work, but the cake will be slightly lighter.
- Don’t skip the warm-water step: The warm water helps the honey dissolve and keeps the batter from becoming too stiff. Make sure it’s warm, not hot, so it doesn’t cook the eggs.
- Beat long enough: The batter needs to reach the ribbon stage. If you don’t beat it long enough, the cake will be flat and dense. Set a timer for 8 minutes and watch the texture.
- Wrap while slightly warm: If you’re giving the cake as a gift, wrap it in plastic wrap while it’s still slightly warm (after cooling for 30 minutes) to lock in moisture. This is a common trick for keeping castella soft.
Serving Suggestions
Serve castella at room temperature with green tea or coffee. It’s also lovely with a dollop of whipped cream and fresh berries. For a fun Tomodachi Life touch, cut the cake into small squares and present them in a gift box with a ribbon — just like the in-game item.
Variations
- Matcha Castella: Replace 1 tablespoon (8 g) of the flour with matcha powder and sift together. This gives a pleasant green tea flavor.
- Chocolate Castella: Replace 2 tablespoons (16 g) of flour with unsweetened cocoa powder. Add 1/4 cup (60 ml) melted dark chocolate to the batter after folding.
- Brown Sugar Castella: Substitute half the granulated sugar with light brown sugar for a deeper, molasses-like flavor.
- Gluten-Free: Use a gluten-free all-purpose flour blend (with xanthan gum) in place of bread flour. The texture will be slightly more tender and may crumble a bit more.
Storage and Reheating
Store castella in an airtight container at room temperature for up to 3 days. For longer storage, wrap tightly in plastic wrap and refrigerate for up to 5 days or freeze for up to 2 months. To serve, bring to room temperature or warm slices in a microwave for 10–15 seconds. Do not overheat, as it can dry out.
Frequently Asked Questions
Why did my castella sink in the middle?
This usually happens if the batter was underbeaten or if the oven door was opened during baking. Make sure you beat the eggs to the ribbon stage and avoid opening the oven for the first 30 minutes.
Can I use cake flour instead of bread flour?
Yes, but the texture will be lighter and more delicate. If using cake flour, reduce the amount to 1 1/3 cups (160 g) and expect a slightly less chewy crumb.
How do I get a perfectly flat top?
After baking, some people invert the cake onto a wire rack and let it cool upside down. This helps flatten the top. Alternatively, trim the top with a serrated knife once cool.
Can I make this without honey?
Honey adds moisture and flavor. You can substitute with light corn syrup or maple syrup, but the flavor will change slightly. If using maple syrup, reduce the sugar to 3/4 cup (150 g) to balance sweetness.
Why is my castella dry?
Overbaking is the most common cause. Check the cake at 40 minutes and remove it as soon as a skewer comes out clean. Also, be sure to cover with plastic wrap while cooling to trap steam.
Can I double the recipe?
Yes, you can double it and bake in a 9×13-inch (23×33 cm) pan. Increase the baking time to 50–55 minutes, and check for doneness with a skewer.
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