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This Passover chocolate sponge cake is light and airy without any flour. Whipped egg whites give it structure, Dutch-process cocoa gives deep chocolate flavor, and a little potato starch adds just enough body.
Whipping the Eggs
Separate the eggs carefully, since even a trace of yolk keeps the whites from whipping. Beat the yolks with part of the sugar, oil, water and vanilla, then whip the whites with the rest of the sugar to soft peaks. Fold the whites into the chocolate mixture gently, in stages, so you don’t lose the air. Bake until a tester comes out clean.
Kosher Notes
This cake is pareve, so it can follow a meat Seder meal. Use cocoa, potato starch and vanilla certified kosher for Passover, and check each egg for blood spots.
Storing
The cake improves overnight wrapped at room temperature and keeps for 3 days.

Ingredients
What I use for this recipe
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Method
- Preheat oven to 350°F (175°C). Grease a 9-inch springform pan with oil and dust lightly with cocoa powder.
- In a large bowl, whisk egg yolks with 1/2 cup sugar until pale and thick, about 3 minutes. Mix in oil, warm water, vanilla, and salt.
- Sift cocoa powder and potato starch together, then whisk into egg yolk mixture until smooth.
- In a clean bowl with clean beaters, whip egg whites until foamy. Gradually add remaining 1/4 cup sugar and beat until soft peaks form.
- Fold 1/3 of egg whites into chocolate mixture to lighten it, then gently fold in remaining whites in 2 additions until just combined.
- Pour batter into prepared pan and smooth top gently. Bake 32-35 minutes until cake springs back when lightly touched.
- Cool completely in pan before removing sides. Dust with powdered sugar before serving if desired.
Notes
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