Fluffy Castella Sponge Cake

INGREDIENTS:

For the Castella Cake:

10 large eggs

1 cup granulated sugar

1 cup cake flour (or all-purpose flour sifted 3x)

2 tbsp honey (or light corn syrup)

½ tsp cream of tartar (optional, for volume boost)

DIRECTIONS:

Step 1: Preheat Oven

Preheat your oven to 325°F (160°C). Line a loaf pan (about 9×5 inches) with parchment paper, extending up the sides for easy removal.

Step 2: Whip Eggs & Sugar

In a large mixing bowl (stand mixer or hand mixer), combine eggs, sugar, and cream of tartar (if using). Whip on high speed for 8–10 minutes until thick, pale yellow, and tripled in volume. The mixture should fall in a slow ribbon when you lift the whisk.

Step 3: Add Honey

Gently fold in the honey using a spatula until fully incorporated …