Castella cake is a classic Japanese sponge cake with Portuguese roots, known for its dense, moist crumb and subtle honey sweetness. It uses just a few simple ingredients—eggs, sugar, flour, and honey—but the technique of whipping the eggs to a thick ribbon stage and baking low and slow gives it its signature fine texture. This recipe produces a beautifully golden, tender cake that slices cleanly and tastes even better the next day.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), room temperature
- 1 cup (200 g) granulated sugar
- 3 tbsp (60 g) honey
- 2 tbsp (30 ml) hot water (about 50°C / 122°F)
- 1 1/4 cups (160 g) bread flour or all-purpose flour, sifted
- 1/4 cup (60 ml) milk, warmed
Instructions
- Preheat your oven to 320°F (160°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 small bowl, dissolve the honey in the hot water. Set aside.
- In a large mixing bowl, combine the eggs and sugar. 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 40°C / 104°F). This should take 2–3 minutes.
- Remove the bowl from the heat. Using a hand mixer or stand mixer with the whisk attachment, beat the egg mixture on high speed for about 5–7 minutes, until it becomes thick, pale, and triples in volume. When you lift the whisk, the batter should fall back in a thick ribbon that slowly dissolves on the surface. This is the ribbon stage.
- Reduce the mixer speed to low and beat for another 2 minutes to stabilize the foam and remove large bubbles.
- Add the honey-water mixture and the warmed milk. Mix on low speed just until combined, about 30 seconds.
- Gradually sift the flour into the batter in three additions, folding gently with a spatula after each addition. Use a cutting motion from the bottom of the bowl up and over, rotating the bowl as you go. Be careful not to overmix—you want no dry streaks, but you also don’t want to deflate the batter.
- Pour the batter into the prepared pan. Tap the pan firmly on the counter a few times to release any large air bubbles.
- Bake at 320°F (160°C) for 15 minutes, then reduce the oven temperature to 300°F (150°C) and bake for another 60 minutes, or until a skewer inserted into the center comes out clean. The top should be deep golden brown and slightly domed.
- Remove the cake from the oven and immediately cover the pan with a clean kitchen towel. Let it cool completely in the pan, still covered, for about 1 hour. This helps keep the crust soft and prevents cracking.
- Once cool, lift the cake out using the parchment overhang. Wrap it tightly in plastic wrap and refrigerate for at least 4 hours or overnight before slicing. This makes the cake easier to cut into clean, even slices.
Tips
- Use bread flour: Bread flour gives castella its characteristic dense, chewy crumb. If you only have all-purpose, it will still work but the texture will be slightly lighter.
- Don’t skip the ribbon stage: Under-whipping the eggs will result in a flat, dense cake. The batter should be thick enough that when you lift the whisk, the ribbon that falls back takes a few seconds to disappear into the surface.
- Fold gently: Overmixing deflates the batter and makes the cake tough. Use a light hand and stop as soon as the flour is incorporated.
- Chill before slicing: Castella is notoriously sticky and crumbly when warm. Refrigerating it overnight firms up the crumb and makes it much easier to cut clean, neat slices.
Serving Suggestions
Castella is delicious on its own with a cup of green tea or coffee. For a dessert, serve slices with fresh strawberries and lightly sweetened whipped cream. You can also toast a slice lightly and spread it with butter or jam for breakfast.
Variations
- Matcha Castella: Replace 1 tablespoon (10 g) of the flour with matcha powder and sift together before adding.
- Brown Sugar Castella: Substitute half of the granulated sugar with light brown sugar for a deeper, molasses-like flavor.
- Honey-Free: If you prefer not to use honey, replace it with 3 tablespoons (45 ml) of maple syrup or golden syrup.
Storage and Reheating
Store the cake tightly wrapped in plastic wrap in the refrigerator for up to 5 days. The flavor actually improves after a day or two as the honey and moisture distribute evenly. For longer storage, wrap the cake in plastic wrap and then aluminum foil, and freeze for up to 3 months. Thaw in the refrigerator overnight. To serve warm, microwave a slice for 10–15 seconds, or toast it lightly in a toaster oven.
Frequently Asked Questions
Why did my castella collapse in the middle?
This usually happens if the batter was under-whipped or overmixed, which deflates the foam. Make sure you reach the ribbon stage and fold gently. Also, avoid opening the oven door during the first 30 minutes of baking.
Can I use a different pan size?
Yes, you can use an 8-inch (20 cm) square pan or a round cake pan. The baking time may be slightly shorter if the pan is wider, so check for doneness at around 50 minutes.
Why is my castella too dry?
Overbaking is the most common culprit. Check the cake at the 60-minute mark and remove it as soon as a skewer comes out clean. Also, make sure you measure your flour correctly—spoon it into the cup and level it off, don’t scoop directly from the bag.
Can I make this without a mixer?
Yes, but it will take a lot of elbow grease. Whisk the eggs and sugar by hand over the simmering water until they are warm, then beat vigorously with a wire whisk for about 10–15 minutes until thick and pale. It’s tiring but doable.
What does the honey do?
Honey adds moisture and a subtle floral sweetness, and it also helps the cake stay soft for days. It’s a key ingredient in traditional castella, but you can substitute with other liquid sweeteners if needed.
Why is my cake too dense and heavy?
This can happen if the eggs weren’t whipped enough, or if the flour was overmixed. Also, make sure your eggs are at room temperature—cold eggs don’t whip as well and can lead to a denser texture.
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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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