Grand Castella is a tall, cloud-soft Japanese sponge cake with a deep honey sweetness and a moist, almost custard-like crumb. Unlike airy Western sponges, it is made with whole eggs, sugar, flour, and honey, then baked low and slow so the center stays tender and the top develops a thin, caramelized crust. This recipe gives you that signature jiggly texture at home, using simple techniques that make the cake reliably tall and even.
Ingredients
- 8 large eggs (about 420 g / 14.8 oz), cold
- 1 cup (200 g) granulated sugar
- 1/2 cup (170 g) honey (mild-flavored, like acacia or clover)
- 2 tbsp (30 ml) warm water (about 100°F / 38°C)
- 1 1/2 cups (190 g) cake flour, sifted
- 2 tbsp (30 ml) milk, at room temperature
- 1/2 tsp vanilla extract (optional)
- Butter or oil for greasing the pan
Instructions
- Preheat your oven to 320°F (160°C). Grease a 9x9x3-inch (23x23x8 cm) square pan or an 8-inch (20 cm) round pan with butter, then line the bottom and sides with parchment paper. If using a springform pan, wrap the outside tightly with aluminum foil to prevent water from seeping in during the water bath.
- Separate the eggs: place the whites in a large mixing bowl and the yolks in a separate small bowl. Set both aside. It’s okay if the yolks are cold; you’ll warm them later.
- In a small saucepan, combine the honey and warm water. Heat over low, stirring, just until the honey is thin and runny (about 1 minute). Remove from heat and let cool for 2–3 minutes. You want it warm but not hot—about 110°F (43°C).
- Add the honey mixture to the egg yolks. Whisk until well combined, then add the milk and vanilla (if using). Set aside.
- In a clean, dry bowl, beat the egg whites with an electric mixer on medium speed. When they become foamy, gradually add the sugar, a tablespoon at a time, while continuing to beat. Increase speed to high and beat until stiff, glossy peaks form—about 5–7 minutes. The meringue should be thick and hold a peak that doesn’t droop.
- Gently fold the egg yolk mixture into the meringue using a large rubber spatula. Fold slowly, scraping from the bottom up, until the batter is mostly uniform but still slightly streaky. Do not overmix—you want to keep as much air as possible.
- Sift the cake flour over the batter in two additions, folding gently after each. Fold just until no dry flour remains. The batter will deflate a little; that’s normal, but it should still be airy and pale yellow.
- Pour the batter into the prepared pan. Tap the pan on the counter a few times to pop any large air bubbles. Smooth the top with an offset spatula.
- Place the pan in a larger roasting pan. Pour hot water (about 140°F / 60°C) into the roasting pan until it reaches about 1 inch (2.5 cm) up the sides of the cake pan. Be careful not to splash water into the batter.
- Bake at 320°F (160°C) for 30 minutes. Then reduce the oven temperature to 300°F (150°C) and continue baking for another 60–70 minutes, until the top is deep golden brown and a skewer inserted into the center comes out clean or with just a few moist crumbs. The internal temperature of the cake should read about 200°F (93°C) if you want to check with an instant-read thermometer—this ensures the center is fully set.
- Turn off the oven and leave the cake inside with the door slightly ajar (use a wooden spoon to prop it open) for 15 minutes. This gentle cooling helps prevent the cake from sinking.
- Remove the cake from the water bath and let it cool in the pan on a wire rack for 15 minutes. Then carefully lift it out using the parchment paper and peel off the paper. Let it cool completely on the rack, about 1 hour.
- Once cool, wrap the cake tightly in plastic wrap and refrigerate for at least 4 hours or overnight. This step is crucial—it allows the cake to become moist and dense, like the real castella. Serve chilled or at room temperature.
Tips
- Use cake flour, not all-purpose. Cake flour has lower protein, which gives a softer crumb. If you don’t have it, substitute 1 1/2 cups (190 g) all-purpose flour minus 2 tablespoons (about 15 g), and add 2 tablespoons (15 g) cornstarch.
- Don’t skip the water bath. It keeps the oven moist and prevents the cake from drying out. If you don’t have a roasting pan, place a small pan of hot water on the oven rack below the cake.
- Fold gently but thoroughly. Overmixing deflates the meringue, resulting in a dense, rubbery cake. Fold until you no longer see streaks of flour, then stop.
- Chill overnight for best texture. The cake firms up and becomes moist after refrigeration. If you cut it too soon, it may be crumbly.
Serving Suggestions
Serve Grand Castella as a tea-time treat with green tea or coffee. It’s delicious plain, but you can also dust it lightly with powdered sugar or serve with a dollop of whipped cream and fresh berries. For a richer experience, toast a slice in a dry skillet for a minute per side—the edges become slightly crispy while the center stays soft.
Variations
- Matcha Castella: Replace 2 tablespoons (15 g) of the cake flour with matcha powder and sift together. Add 1/2 tsp more if you like a stronger green tea flavor.
- Brown Sugar Castella: Substitute half the granulated sugar with light brown sugar for a deeper, molasses-like flavor.
- Citrus Castella: Add the zest of 1 orange or lemon to the egg yolk mixture for a bright, aromatic twist.
Storage and Reheating
Store the cake wrapped in plastic wrap in the refrigerator for up to 5 days. It also freezes well: wrap tightly in plastic wrap and then foil, and freeze for up to 2 months. Thaw overnight in the refrigerator before serving. To reheat, place slices on a baking sheet and warm in a 300°F (150°C) oven for 5–7 minutes, or toast in a skillet for 1–2 minutes per side. Avoid microwaving, as it makes the cake rubbery.
Frequently Asked Questions
Why did my cake collapse in the middle? This usually happens if the meringue was overbeaten (making it stiff and dry) or if you opened the oven door during baking. Also, make sure you cool the cake gradually—a sudden temperature change can cause sinking.
Can I use a hand mixer instead of a stand mixer? Yes, but it will take longer—about 8–10 minutes to whip the egg whites to stiff peaks. Be patient and don’t rush; the meringue must be very firm.
My cake is too dense and heavy. What went wrong? Overmixing the batter after adding flour is the most common culprit. Fold only until no flour is visible. Also, make sure your egg whites are at stiff peaks before folding—if they’re underwhipped, the cake won’t rise properly.
Can I make this without a water bath? Yes, but the cake will be drier and may crack on top. The water bath is key to the moist, tender texture. If you skip it, reduce the oven temperature to 300°F (150°C) for the entire bake and expect a slightly less soft result.
Do I have to refrigerate the cake before serving? It’s not mandatory, but it’s highly recommended. Chilling the cake for at least 4 hours (or overnight) allows the moisture to redistribute, making the texture more uniform and dense. If you serve it warm, it will be more like a soufflé—still tasty, but not traditional.
Can I use a different pan size? Yes, but adjust the baking time. A wider pan (like a 9×13-inch) will yield a thinner cake that bakes faster—check at 45–50 minutes total. A smaller pan (like a 7-inch) will need a longer bake, up to 1 hour 50 minutes. Keep an eye on it and test with a skewer.
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