Castella cake (kasutera) is a classic Japanese sponge cake with Portuguese roots, known for its dense, moist crumb and sweet honey flavor. In Tomodachi Life, the castella cake is a popular treat that your Mii characters can enjoy, and this recipe recreates that delightful dessert at home. Made with just a few simple ingredients—eggs, sugar, flour, and honey—this cake delivers a rich, tender texture that is perfect for tea time or as a special snack.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), at room temperature
- 1 cup (200 g) granulated sugar
- 1/3 cup (80 ml) honey (preferably mild-flavored, like acacia or clover)
- 1 1/2 cups (180 g) bread flour (or all-purpose flour for a softer crumb)
- 2 tablespoons (30 ml) whole milk (optional, for extra moisture)
Instructions
- Preheat your oven to 320°F (160°C). Line a 9-inch (23 cm) square or round cake pan with parchment paper, ensuring the paper comes up the sides for easy removal.
- In a large mixing bowl, combine the eggs and sugar. Place the bowl over a pot of simmering water (double boiler) and whisk gently until the sugar dissolves and the mixture is lukewarm to the touch (about 100°F / 38°C). This step helps the eggs whip to a thicker, more stable foam.
- Remove the bowl from the heat. Add the honey and milk (if using) and whisk to combine.
- Using an electric mixer, beat the egg mixture on high speed for about 8–10 minutes, until it becomes pale, thick, and triples in volume. When you lift the whisk, the batter should fall in a thick ribbon that slowly dissolves on the surface.
- Sift the bread flour into the batter in three additions, folding gently with a rubber spatula after each addition. Fold just until no streaks of flour remain—do not overmix, or the cake will be tough.
- Pour the batter into the prepared pan. Tap the pan firmly on the counter a few times to release any large air bubbles.
- Bake for 45–50 minutes, or until the top is deep golden brown and a skewer inserted into the center comes out clean. The internal temperature of the cake should reach at least 200°F (93°C) for a fully baked sponge.
- Remove the cake from the oven and immediately cover it with plastic wrap (or a clean kitchen towel) to keep the surface moist. Let it cool completely in the pan, about 1 hour.
- Once cool, lift the cake out using the parchment paper. Peel off the paper and trim the edges if desired. Slice into rectangles or squares to serve.
Tips
- Flour matters: Bread flour gives the authentic chewy texture of castella. If you use all-purpose flour, the cake will be softer and less dense—still delicious, but not as traditional.
- Don’t overfold: Folding the flour too vigorously will deflate the whipped eggs, resulting in a flat, dense cake. Use a gentle hand and stop as soon as the flour is incorporated.
- Honey flavor: Use a mild honey so it doesn’t overpower the delicate egg flavor. If you prefer a stronger honey taste, increase to 1/2 cup (120 ml) and reduce sugar to 3/4 cup (150 g).
- Storage: Castella stays moist for several days if wrapped tightly in plastic wrap and kept at room temperature. Refrigerating it can dry it out, so store it at room temperature for up to 3 days.
Serving Suggestions
Serve castella cake as a tea-time treat alongside green tea or coffee. It also pairs nicely with fresh fruit like strawberries or mango, and a dollop of whipped cream. In Japan, it’s often enjoyed plain, but you can dust it with powdered sugar or drizzle with a little honey for extra sweetness.
Variations
- Matcha Castella: Replace 2 tablespoons (15 g) of the bread flour with matcha powder for a green tea version.
- Chocolate Castella: Substitute 1/4 cup (30 g) of the flour with unsweetened cocoa powder.
- Brown Sugar Castella: Replace the granulated sugar with light brown sugar for a deeper, molasses-like flavor.
- Gluten-Free: Use a gluten-free all-purpose flour blend, but expect a slightly crumblier texture.
Storage and Reheating
Store the castella cake wrapped in plastic wrap at room temperature for up to 3 days. For longer storage, wrap it tightly and freeze for up to 1 month. To thaw, leave it at room temperature for about 2 hours. If you prefer it warm, microwave a slice for 10–15 seconds, but note that it will become softer and more tender.
Frequently Asked Questions
Why is my castella cake sunken in the middle? A sunken center usually happens when the cake is underbaked or when the oven temperature is too low. Make sure your oven is properly preheated and bake until a skewer comes out clean. Also, avoid opening the oven door during baking.
Can I use all-purpose flour instead of bread flour? Yes, you can. All-purpose flour will yield a lighter, less chewy cake, but it will still be delicious. For a more authentic texture, use bread flour.
Why is my cake too dry? Overbaking or using too much flour can cause dryness. Check the cake at 45 minutes and remove it as soon as it’s done. Also, be sure to measure flour correctly by spooning it into the cup and leveling off.
Can I make this without a mixer? It’s possible, but it will take a lot of elbow grease. Whisking by hand for 15–20 minutes to achieve the ribbon stage is tiring, so a hand or stand mixer is highly recommended.
Is castella cake supposed to be dense? Yes, authentic castella is denser than typical sponge cakes because of the bread flour and the technique of folding rather than folding in whipped egg whites separately. The texture should be moist and slightly chewy.
Can I add flavorings like vanilla or lemon? Absolutely. Add 1 teaspoon of vanilla extract or the zest of one lemon to the egg mixture before whipping for a subtle flavor twist.
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