Lemon Almond Sponge Cake for Pesach

Author: Jamie Schler 

The Lemon Almond Sponge Cake 
4 large eggs, separated
1 cup sugar
Finely grated zest and juice from ½ lemon
¼ tsp vanilla extract
½ cup ground almonds
½ cup potato flour
Pinch salt + few drops lemon juice for whites
Handful slivered blanched almonds to decorate, optional

The Warm Lemon Sauce 
2 cups water
1 cup sugar
Finely grated zest and juice from 1 lemon
2 Tbs potato starch
2 Tbs butter, cubed and softened

Instructions 

Prepare the Lemon Almond Sponge Cake: 

Preheat the oven to 350°F (180°C). Have ready a springform pan – I used a 7 ¼ inch-diameter x 4 inch-high springform but a regular 8-inch pan is fine, too. 

Separate the eggs; place the yolks in a large mixing bowl and the whites in a medium bowl, preferably plastic or metal. Add a pinch salt and a few drops lemon juice to the whites and set aside. 

Using an electric mixer, beat the egg yolks for three or four minutes until thick and pale. Add the sugar and continue beating until thick and creamy. 

Beat in the zest and juice of ½ a lemon and the vanilla extract until well blended and thick. Quickly beat in the ground almonds. 

Using very clean beaters, beat the egg whites on low speed for 30 seconds, then increase the speed to high; beat the whites until thick, glossy and peaks hold. Do not overbeat until the whites are dry. 

Using a spatula, gently but firmly fold the stiff whites into the lemon almond cake batter in 3 additions. Fold in the potato flour with the third addition of the whites in order to avoid overworking the batter. Fold in the whites just until all the lumps of white have disappeared. 

Gently pour the batter into the springform pan. Dust with a couple of tablespoons slivered almonds. Bake in the preheated oven 30 – 45 minutes, depending on your oven and pan size. The cake is done when puffed, set and golden. Gently press on the top of the cake and it should feel set, much like an angel or sponge cake. A tester inserted in the center should come out dry. 

Remove the pan from the oven onto a cooling rack and allow to cool before unmolding. Carefully run a long, thin blade around the sides to loosen the cake while still warm. 

Prepare the Warm Lemon Sauce by first bringing the water to a boil. 

Sift the cornstarch or potato starch into the sugar in a medium heatproof bowl and stir. Whisk in the boiling water then, when smooth, return to the pan and continue cooking over low heat, whisking or stirring, for 8 to 10 minutes until thickened to the consistency of a sauce. 

Whisk in the lemon zest and juice. Remove from the heat and whisk in the butter a cube at a time until the buttered is melted and incorporated and the mixture is smooth. 

Strain through a mesh strainer if necessary. Store in a jar in the refrigerator; to reheat, simply put the gelled sauce in a saucepan and heat very gently over low, stirring or whisking constantly, until pouring consistency (not too runny) and warm. Strain. Serve warm.