Step 1: Prepare the Baking Pan
Preheat your oven to 150°C (300°F).
Prepare a square or rectangular baking pan, approximately 20 × 20 cm.
Line the bottom and sides with parchment paper, allowing some paper to extend above the edges.
For a traditional soft Castella texture, prepare a larger baking tray with hot water for a gentle water bath.
Step 2: Melt the Butter and Warm the Milk
Place the butter and milk in a small saucepan.
Heat gently until the butter melts completely. Do not allow the mixture to boil.
Remove from the heat and stir in the honey and vanilla extract until combined.
Set aside and keep the mixture slightly warm.
Step 3: Prepare the Eggs
Separate the egg yolks from the whites.
Place the egg whites in a clean, dry mixing bowl.
Make sure there is no trace of egg yolk in the whites, as this can prevent them from whipping properly.
Step 4: Whip the Egg Whites
Using an electric mixer, beat the egg whites until they become foamy.
Gradually add the sugar in three portions while continuing to beat.
Whip until you obtain a glossy, firm meringue with soft-to-medium peaks.
Avoid overbeating because a dry meringue can make folding difficult.
Step 5: Add the Egg Yolks
Add the egg yolks one at a time to the whipped egg whites.
Mix gently on low speed until the mixture becomes smooth, pale yellow, and evenly combined.
The batter should remain light and airy.
Step 6: Sift in the Bread Flour
Sift the bread flour and salt into the egg mixture in two or three portions.
Using a spatula, gently fold the flour into the batter.
Use slow movements from the bottom of the bowl toward the top.
Avoid vigorous mixing because preserving the air in the batter is essential for achieving the cake’s soft, fluffy texture.
Step 7: Incorporate the Warm Milk Mixture
Take a small amount of cake batter and mix it into the warm butter, milk, and honey mixture.
Stir until smooth.
Pour this mixture back into the main batter in a thin stream.
Gently fold until everything is fully incorporated.
Do not overmix or allow the batter to lose too much volume.
Step 8: Pour the Batter into the Pan
Pour the prepared batter into the lined baking pan.
Use a spatula to spread it evenly.
Tap the pan gently against the countertop several times to release large air bubbles.
You can also run a skewer through the batter in a gentle zigzag motion to remove trapped air.
Step 9: Bake the Castella Cake
Place the cake pan inside a larger baking tray.
Carefully pour hot water into the larger tray to create a water bath.
Bake at 150°C (300°F) for approximately 60–70 minutes.
The cake is ready when the top becomes beautifully golden brown and a toothpick inserted into the center comes out clean.
Baking times may vary depending on your oven and pan size.
Step 10: Cool the Cake
Remove the cake from the oven and carefully lift it out of the water bath.
Let it rest for a few minutes.
Remove the cake from the pan and gently peel away the parchment paper.
Allow it to cool completely on a wire rack.
For an especially moist texture, wrap the completely cooled cake in plastic wrap and refrigerate it for several hours before slicing.
Step 11: Slice and Serve
Using a sharp serrated knife, trim the edges if desired.
Cut the Castella Cake into thick rectangular slices.
You should see a beautiful golden top and a soft, delicate yellow interior.
Serve at room temperature or slightly chilled.
Tips for the Perfect Japanese Castella Cake
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