Le Castella Cake: Fluffy Japanese Sponge Recipe

Le Castella is a Japanese sponge cake with Portuguese roots, known for its fine crumb, bouncy texture, and subtle honey sweetness. Made from just eggs, sugar, flour, and honey, it relies on technique rather than butter or oil for its signature softness. This recipe uses a hot-water bath to keep the oven moist, which helps the cake bake evenly without cracking or drying out.

Ingredients

6 large eggs (room temperature)
1 cup (200 g) granulated sugar
3 tbsp (60 g) honey
1 cup (120 g) cake flour, sifted
2 tbsp (30 ml) whole milk, warmed
1 tbsp (15 ml) vegetable oil
Pinch of salt

Instructions

Preheat your oven to 320°F (160°C). Line a 9-inch (23 cm) square or round cake pan with parchment paper, making sure the paper comes up the sides for easy removal.
Fill a large roasting pan or baking dish with about 1 inch (2.5 cm) of hot water and place it on the lower oven rack. This will create the steam bath for baking.
In a large heatproof bowl, whisk the eggs and sugar together. Place the bowl over a pot of simmering water (make sure the bottom doesn’t touch the water) and whisk constantly until the sugar dissolves and the mixture is lukewarm, about 2–3 minutes.
Remove the bowl from the heat. Add the honey and salt, then beat with an electric mixer on high speed for about 8–10 minutes, until the batter is thick, pale, and falls from the whisk in a slow ribbon that holds its shape for a few seconds.
In a separate small bowl, mix the warmed milk and vegetable oil. Set aside.
Sift the cake flour into the egg mixture in three additions, folding gently with a spatula after each addition. Fold just until no streaks of flour remain—do not overmix.
Take a cup of the batter and stir it into the milk-oil mixture until smooth. Then pour this mixture back into the main batter and fold gently until fully incorporated.
Pour the batter into the prepared pan. Tap the pan on the counter a few times to release large air bubbles.
Place the cake pan into the water bath in the oven. Bake at 320°F (160°C) for 55–60 minutes, until the top is golden brown and a skewer inserted into the center comes out clean. (If the top browns too quickly, cover loosely with foil after 30 minutes.)
Once done, turn off the oven and leave the cake inside with the door slightly ajar for 10 minutes. Then remove it from the oven and let it cool completely in the pan on a wire rack.
Once cool, lift the cake out using the parchment paper. Peel off the paper, trim the edges if desired, and cut into slices. For best texture, wrap the cake in plastic wrap and refrigerate for at least 4 hours or overnight before serving—this makes the crumb denser and more moist.

Tips

Use cake flour: Cake flour has lower protein than all-purpose, giving a softer crumb. If you only have all-purpose, replace 2 tablespoons (16 g) of it with cornstarch and sift together.
Don’t skip the water bath: The steam keeps the oven moist, preventing the top from cracking and the cake from drying out. If you don’t have a roasting pan, place a small pan of hot water on the rack below the cake.
Fold gently: Overmixing deflates the whipped eggs, making the cake dense. Use a spatula and cut down, then sweep up from the bottom—stop when no flour is visible.
Cool completely before cutting: The cake is very fragile when warm. Chilling it in the fridge for a few hours makes slicing clean and the texture even better.

Serving Suggestions

Serve le castella at room temperature with green tea or coffee. It’s also delicious lightly toasted in a toaster oven for a crisp edge. For a dessert, top slices with fresh berries and a dollop of whipped cream, or drizzle with a little honey.

Variations

Matcha: Replace 1 tablespoon (8 g) of cake flour with matcha powder and sift together.
Chocolate: Replace 2 tablespoons (16 g) of cake flour with unsweetened cocoa powder.
Brown sugar: Substitute half the granulated sugar with light brown sugar for a deeper flavor.
Lemon: Add 1 tablespoon of lemon zest to the batter along with the honey.

Storage and Reheating

Store le castella in an airtight container at room temperature for up to 2 days, but it’s best refrigerated. In the fridge, it will keep for up to 5 days—wrap it tightly in plastic wrap to prevent drying. To freeze, wrap the whole cake or slices in plastic wrap and then foil; freeze for up to 1 month. Thaw overnight in the refrigerator before serving. To refresh, microwave a slice for 10–15 seconds or toast it lightly.

Frequently Asked Questions

Why did my cake crack on top? Cracks usually happen if the oven is too hot or the batter is overmixed. Make sure your oven is accurate with an oven thermometer, and don’t skip the water bath—it keeps the surface moist and flexible.

Can I make this without a water bath? Yes, but the cake will be drier and more likely to crack. If you skip it, place a small pan of hot water on the rack below the cake and check for doneness a few minutes earlier.

Why is my cake dense and rubbery? This often happens when the eggs are under-whipped or the batter is overfolded. Whip the eggs until they reach ribbon stage (thick and pale), and fold just until the flour disappears.

Can I use all-purpose flour instead of cake flour? Yes, but the texture will be slightly denser. To mimic cake flour, remove 2 tablespoons (16 g) from 1 cup of all-purpose flour and replace with cornstarch, then sift together.

Why does my cake stick to the pan? Make sure to line the pan completely with parchment paper, including the sides. Also, let the cake cool completely before removing—it’s very tender when warm.

Can I use honey substitutes? Yes, you can use maple syrup or golden syrup, but the flavor will change. Keep the same amount (60 g) and note that maple syrup may make the cake slightly more moist.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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