Strawberry castella cake is a soft, cloud-like Japanese sponge cake made from just eggs, sugar, flour, and honey, then layered with fresh strawberries and whipped cream. This version bakes the classic honey-sweetened sponge in a loaf pan, so it stays incredibly moist and tender while the berries add a bright, fruity contrast. The key is the technique—whipping the eggs to a thick ribbon and folding gently—which gives you that signature jiggly, fine-crumb texture without any chemical leavener.
Ingredients
- 6 large eggs (300 g), room temperature
- 1 cup (200 g) granulated sugar
- 2 tbsp (30 ml) honey
- 1 cup (120 g) cake flour, sifted twice
- 2 tbsp (30 ml) whole milk, room temperature
- 1 tsp vanilla extract
- 1½ cups (360 ml) heavy whipping cream
- 3 tbsp (40 g) powdered sugar
- 1 tsp vanilla extract (for cream)
- 1 lb (450 g) fresh strawberries, hulled and sliced
- 2 tbsp (30 g) strawberry jam (optional, for brushing)
Instructions
- Preheat your oven to 320°F (160°C). Line a 9×5-inch (23×13 cm) loaf pan with parchment paper, leaving an 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 water doesn’t touch the bowl) and whisk constantly until the mixture reaches 104°F (40°C) and the sugar dissolves, about 2–3 minutes. Remove from heat.
- Using a hand mixer or stand mixer with the whisk attachment, beat the egg mixture on high speed until it triples in volume and falls in a thick ribbon that holds its shape for a few seconds when you lift the whisk. This takes 5–7 minutes. Then reduce to low speed and beat for 1 minute to stabilize the foam.
- Gently fold the sifted cake flour into the egg foam in three additions, using a spatula. Cut through the center and scrape the bottom of the bowl with each fold, rotating the bowl. Be careful not to deflate the batter—it should remain airy and smooth.
- In a small bowl, mix the milk and vanilla extract. Pour this mixture along the side of the batter and fold it in quickly but gently, just until combined.
- Pour the batter into the prepared loaf pan. Tap the pan on the counter a few times to release any large air bubbles. Place the pan in the oven and bake for 38–42 minutes, until the top is golden brown and a toothpick inserted into the center comes out clean. The cake should spring back when lightly pressed.
- Remove the cake from the oven and immediately drop the pan from a height of about 4 inches (10 cm) onto the counter to prevent shrinking. Let it cool in the pan for 5 minutes, then lift it out using the parchment overhang and transfer to a wire rack. Let cool completely, about 1 hour.
- While the cake cools, make the whipped cream: In a chilled bowl, beat the heavy cream, powdered sugar, and vanilla on medium-high speed until soft peaks form. Refrigerate until ready to use.
- Once the cake is completely cool, slice it horizontally into three even layers. If you like, brush the cut sides with a little strawberry jam for extra flavor.
- Place one layer on a serving plate and spread a third of the whipped cream over it. Top with a layer of sliced strawberries. Repeat with the second layer, then the third. Use the remaining cream to frost the top and sides of the cake. Decorate with whole or halved strawberries.
- Refrigerate the assembled cake for at least 30 minutes before slicing to help it set. Use a serrated knife to cut clean slices.
Tips
- Room-temperature eggs are essential. Cold eggs won’t whip to full volume. If you’re short on time, place the eggs in a bowl of warm water for 5 minutes before cracking.
- Don’t overmix the flour. Fold just until no streaks of flour remain. Overmixing deflates the airy batter and makes the cake dense and rubbery.
- Use cake flour, not all-purpose. Cake flour has lower protein, which gives the castella its delicate, tender crumb. If substituting, use 1 cup (120 g) all-purpose flour minus 2 tablespoons, and add 2 tablespoons cornstarch.
- Chill the cake before slicing. A warm cake will crumble and the cream will slide. The 30-minute chill in the fridge makes clean, neat slices.
Serving Suggestions
Serve this strawberry castella cake as a show-stopping dessert at afternoon tea, birthdays, or spring gatherings. It pairs beautifully with a cup of green tea, jasmine tea, or a light coffee. For an extra touch, dust the top with powdered sugar just before serving, or drizzle with a little melted white chocolate. The cake is also lovely with a side of extra sliced strawberries and a dollop of whipped cream.
Variations
- Matcha Strawberry Castella: Replace 1 tablespoon of the cake flour with 1 tablespoon of matcha powder. Sift it with the flour and proceed as directed. The earthy matcha complements the sweet strawberries.
- Blueberry or Raspberry: Swap the strawberries for fresh blueberries or raspberries. Use the same amount and fold them into the cream instead of layering them, if you prefer.
- Chocolate Castella: Replace 2 tablespoons of the cake flour with 2 tablespoons of unsweetened cocoa powder. Pair with a chocolate whipped cream for a double-chocolate version.
- No-Bake Strawberry Shortcake: Skip the baking entirely and use store-bought sponge cake or ladyfingers. Layer with the same cream and strawberries, then chill for 2 hours.
Storage and Reheating
Store the assembled strawberry castella cake in an airtight container in the refrigerator for up to 3 days. The cream will soften the cake slightly, which is normal and delicious. If you have unfrosted sponge layers, wrap them tightly in plastic wrap and store at room temperature for up to 2 days, or freeze for up to 1 month. To freeze the assembled cake, place it in the freezer for 2 hours until firm, then wrap in plastic wrap and foil; thaw overnight in the refrigerator before serving. This cake is best served cold—no reheating needed. If you prefer a warm slice, microwave a single piece for 10 seconds, but expect the cream to melt.
Frequently Asked Questions
Why did my castella cake collapse? The most common reason is underwhipping the eggs. If the egg mixture hasn’t reached the ribbon stage, the batter won’t have enough structure to support the cake as it bakes. Also, make sure you fold gently and don’t open the oven door during baking.
Can I use frozen strawberries? Yes, but thaw them first and pat them dry with paper towels to remove excess moisture. Too much liquid will make the cream runny and the cake soggy.
What if I don’t have cake flour? You can make a substitute: measure 1 cup (120 g) all-purpose flour, remove 2 tablespoons, and replace with 2 tablespoons of cornstarch. Sift together three times. This mimics the lower protein content of cake flour.
Can I make this cake without honey? Honey adds moisture and that classic castella flavor. You can substitute with light corn syrup or golden syrup in the same amount, but the flavor will be slightly different. You could also use maple syrup, but it will add a stronger taste.
Why is my cake rubbery? Overmixing the flour or overbeating the eggs after adding the flour can develop too much gluten and deflate the air, resulting in a rubbery texture. Be gentle and stop as soon as the flour is incorporated.
Can I bake this in a round pan? Absolutely. Use a 9-inch (23 cm) round cake pan and adjust the baking time to 30–35 minutes. The cake will be slightly taller, so check for doneness with a toothpick.
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