The Best Castella Recipe (Moist and Gooey Kasutera Sponge Cake)

Let’s make moist and gooey Castella with the cardboard box wrapped with aluminum foil!

Castella (Moist and Gooey Kasutera Cake)

Course Dessert
Cuisine Japanese
Servings 1 Cake (19x19x8cm/7.5"x7.5"x3.2")
Cook Time 90 minutes Cooling time not included in cook time.
Translator Get Francis Mug
* 1 tablespoon (tbsp) = 15 ml, 1 teaspoon (tsp) = 5 ml
* The ingredients contain Amazon affiliate links.

Instructions

  1. Place the Kraft paper or bakery paper in the cardboard box wrapped with aluminum foil and distribute the coarse demerara sugar or coffee sugar crystals.
  2. Lightly beat the eggs in a bowl with a hand mixer at a low speed. Add the sugar and mix.
  3. Float the bowl in hot water and gradually heat the egg. When it begins to slightly warm up, remove the bowl and continue mixing. Turn off the burner and heat a glass of water.
  4. Beat the egg at high speed for about 8 minutes until the color turns white, and it reaches a soft peak stage. When you lift the mixer, the rippling pattern should remain on the surface as you see here.
  5. Dilute the honey with the heated water. Add it to the beaten egg and mix with the hand mixer for 1 more minute at high speed. Switch to low speed and mix for about another minute until it has a fine, glossy texture.
  6. Distribute the bread flour onto the egg mixture. At medium speed, whip the mixture for about 2 minutes until it has a smooth texture again.
  7. Drop the bowl a few times to break any air bubbles. Then, pour the batter into the square mold. Slash the batter with a spatula to remove any air bubbles.
  8. Place the batter into a preheated conventional oven. For the first 15 minutes, bake at 170°C (340°F). Then, reduce the heat to 160°C (320°F) and bake it for about 50 more minutes. The baking temperature and time depend on the type of your oven, so adjust them accordingly.
  9. Pierce the castella with a bamboo stick. If the stick is slightly moist, it is ready. When the stick is dry and clean, the castella has lost its moist texture. The moist texture is essential for delicious castella so avoid over-baking.
  10. Remove the mold and drop it on the counter a few times to prevent the castella from shrinking. Place a tray covered with plastic wrap on top. Then, flip it over.
  11. Before placing the tray onto the castella, we recommend making a cut along the corners of the Kraft paper and folding the edges outward. This will help avoid damaging the surface of the castella. Now, remove the mold.
  12. Wrap it with 2 layers of plastic wrap crosswise, completely covering the castella. Let it sit to cool and then store the castella in the fridge for one whole day. This will make it moist and even more delicious.
  13. Let’s serve the castella. Carefully remove the Kraft paper and slice off the edges. For each cut, wipe the knife with a dampened towel to help make a clean cut.
  14. Cut the castella in half. Then, slice it into 3cm (1.2") pieces. Arrange the pieces onto a plate.
  15. We will show you how to make the homemade mold for castella. This is the Kraft paper with 4 slits.
  16. The cardboard box is wrapped with aluminum foil.
  17. To wrap the box, carefully cover it with a long strip of aluminum foil.
  18. Then, cover it with another aluminum strip crosswise. If you don’t have a square cake pan, try making it as shown.

Recipe Notes

All-purpose flour or cake flour can be also used but we recommend using bread flour to help create a moist and kind of gooey texture.
You can keep the castella in the fridge for 1 week or store it in the freezer for up to 1 month.
Castella goes great with green tea, coffee or black tea and it is a perfect gift for special occasions.

This post was last modified on 09/15/2020

Share
Cooking with Dog

FOLLOW ME! Cooking with Dog is a YouTube cooking show featured by a canine host Francis and a mysterious Japanese Chef whose real name is not disclosed.

View Comments

  • hi, my oven is a convection (fan) oven, may i know if i should reduce the cooking time or change the temperature? thank you so much!

    Cancel reply

    Leave a Reply

    Your email address will not be published. Required fields are marked*

    • Whether it's a convection oven or a regular oven, each oven is unique. The temperature may be higher or lower than the setting, or the baking color may become uneven. When you make it for the first time, keep your eyes on the baking color of the sponge cake and adjust the temperature or baking time. Good luck in your kitchen.😊

      Cancel reply

      Leave a Reply

      Your email address will not be published. Required fields are marked*

  • Did it multiple times in my pretty old electric oven and even on the first try it turned out great.

    Baked it at my parents place with their much newer premium oven and the cake got burnt after 35 minutes, had to quit baking it... It came completely dry and crusty.
    Any ideas? The temperatures were correct at the very least... Perhaps newer ovens circulate air and remove moisture?

    Cancel reply

    Leave a Reply

    Your email address will not be published. Required fields are marked*

    • We're glad you've tried our castella recipe multiple times.😍

      If your cake gets burnt and dry, try the following methods.

      1. Lower the temperature of the oven.
      2. Cover the cake with aluminum foil from the middle of the baking process.

      Hope these help improve the cake with the oven.🐩👩‍🍳 Thank you💓

      Cancel reply

      Leave a Reply

      Your email address will not be published. Required fields are marked*

  • Can I use cake flour instead of bread flour?

    Cancel reply

    Leave a Reply

    Your email address will not be published. Required fields are marked*

    • You can try cake flour instead of the bread flour, but you may not get a moist, gooey texture, which is the characteristic of castella cake.🍰😊

      Cancel reply

      Leave a Reply

      Your email address will not be published. Required fields are marked*

  • Hello. I'm wondering if I can continue without the heating eggs part, because I don't have the equipment. Can I really do that?

    Cancel reply

    Leave a Reply

    Your email address will not be published. Required fields are marked*

    • You can use any pot or pan if the bottom of the bowl is submerged in hot water.😊

      Cancel reply

      Leave a Reply

      Your email address will not be published. Required fields are marked*

  • Hi! Thank you for sharing the video and recipe. I was wondering if can I substitute the bread flour with gluten free flour?

    Cancel reply

    Leave a Reply

    Your email address will not be published. Required fields are marked*

    • You can try gluten-free flour instead of the bread flour, but you may not get a moist, gooey texture☺️ Thank you for watching our videos❣️ Hope you will enjoy delicious castella🍰😋

      Cancel reply

      Leave a Reply

      Your email address will not be published. Required fields are marked*

Leave a Reply

Your email address will not be published. Required fields are marked*