Castella cake is a classic Japanese sponge cake made from just a few simple ingredients—eggs, sugar, flour, and honey—known for its dense, moist crumb and deep golden-brown crust. It is the perfect centerpiece for a mukbang because its soft, springy texture is incredibly satisfying to watch and eat, and it pairs beautifully with milk or tea. This recipe delivers an authentic, bakery-style castella that slices cleanly and has that signature bouncy bite.
Ingredients
- 6 large eggs (about 300 g / 10.5 oz), at room temperature
- 1 cup (200 g) granulated sugar
- 3 tablespoons (60 g) honey
- 2 tablespoons (30 ml) whole milk
- 1 cup (120 g) bread flour (or all-purpose flour, sifted)
- 1/4 teaspoon salt
Instructions
- Preheat your oven to 320°F (160°C). Line a 9×5-inch (23×13 cm) loaf pan with parchment paper, making sure the paper extends above the edges for easy lifting.
- Fill a large skillet or roasting pan with about 1 inch of hot water and place it on the bottom rack of the oven. This creates a steam bath that helps the cake stay moist and prevents cracking.
- In a large heatproof bowl, combine the eggs, sugar, and honey. Place the bowl over a pot of simmering water (make sure the bottom of the bowl does not touch the water). Whisk gently until the mixture is warm to the touch (about 100°F / 38°C) and the sugar has dissolved. Remove from heat.
- Using a hand mixer or stand mixer with the whisk attachment, beat the egg mixture on high speed for 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 holds its shape on the surface for a few seconds.
- Add the milk and salt to the batter and gently fold with a spatula until just combined.
- Sift the flour into the batter in two additions, folding gently after each addition. Be careful not to deflate the batter—fold until no streaks of flour remain.
- Pour the batter into the prepared loaf 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 read 200°F (93°C) for a fully set crumb.
- Immediately after baking, invert the cake onto a wire rack (this helps flatten the top). Remove the parchment paper and let it cool completely, about 1 hour.
- Once cool, wrap the cake tightly in plastic wrap and let it rest at room temperature for at least 4 hours, or overnight. This resting period is essential for the texture to become moist and firm enough to slice cleanly.
Tips
- Use bread flour for the best crumb: Bread flour has more protein than all-purpose, which gives castella its characteristic chewy, dense texture. If you only have all-purpose, the cake will be slightly softer but still delicious.
- Don’t skip the resting time: The cake needs to rest after baking to allow the moisture to redistribute. Cutting it too soon will result in a gummy, sticky crumb that falls apart.
- Check your oven temperature: An oven that runs hot can cause the top to brown too quickly while the center remains undercooked. If your cake browns too fast, tent it loosely with aluminum foil after 30 minutes.
- Use room-temperature eggs: Cold eggs don’t whip as well and can make the batter curdle. If you’re in a hurry, place the eggs in a bowl of warm water for 5 minutes before starting.
Serving Suggestions
Castella is traditionally served as a snack or dessert, sliced into thick, even pieces. For a mukbang, serve it with a tall glass of cold milk, a cup of hot green tea, or a scoop of vanilla ice cream. You can also toast a slice lightly and spread it with butter for a different texture. The cake is sweet enough on its own, but a drizzle of honey or a dusting of powdered sugar adds extra flair.
Variations
- Matcha Castella: Replace 1 tablespoon (8 g) of the flour with matcha powder and sift together. This adds a subtle earthy flavor and a beautiful green color.
- Chocolate Castella: Replace 2 tablespoons (16 g) of flour with unsweetened cocoa powder. You may need to increase the milk by 1 tablespoon (15 ml) to keep the batter moist.
- Brown Sugar Castella: Substitute the granulated sugar with light brown sugar for a deeper, molasses-like flavor. The cake will be slightly darker in color.
- Gluten-Free Castella: Use a gluten-free all-purpose flour blend that contains xanthan gum. The texture will be slightly more tender, but still very enjoyable.
Storage and Reheating
Store leftover castella tightly wrapped in plastic wrap at room temperature for up to 3 days. For longer storage, wrap it well and refrigerate for up to 1 week, or freeze for up to 2 months. To freeze, slice the cake first and wrap each slice individually so you can thaw only what you need. Thaw frozen slices at room temperature for about 30 minutes. To reheat, wrap a slice in a damp paper towel and microwave for 10–15 seconds, or toast it in a toaster oven for 2–3 minutes until warm and slightly crisp on the outside.
Frequently Asked Questions
Why is my castella cake dense and heavy?
This usually happens if the egg foam was deflated during folding, or if the flour was overmixed. Be very gentle when folding, and stop as soon as the flour is incorporated. Also, make sure your eggs are whipped to the ribbon stage before adding the flour.
Why does my cake have a crack on top?
A crack can occur if the oven is too hot or if the batter is overmixed, which creates too much gluten. The water bath helps prevent this, but also check your oven temperature with an oven thermometer. Some cracking is normal and can be hidden by serving the cake upside down.
Can I make this without a water bath?
Yes, but the texture may be drier and the top may crack more. The water bath provides moisture and even heat, which is key to the soft, springy crumb. If you skip it, reduce the oven temperature to 300°F (150°C) and bake for about 40–45 minutes.
How do I get a perfectly flat top?
Inverting the cake immediately after baking helps flatten the top. Also, make sure to tap the pan before baking to remove air bubbles, and avoid opening the oven door during the first 30 minutes.
Can I use a hand mixer instead of a stand mixer?
Yes, a hand mixer works fine, but you may need to beat the eggs longer—up to 12–15 minutes—to reach the ribbon stage. Make sure the bowl is large enough to accommodate the volume.
Why does my cake taste too eggy?
This can happen if the eggs are not whipped enough or if the cake is underbaked. Ensure the eggs are beaten to a thick, pale foam, and bake until the center is fully set. The honey also helps mask the egg flavor.
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