Family-Size Chocolate Walnut Sponge Cake

Cakes & Coffee Cakes

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Family-Size Chocolate Walnut Sponge Cake

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A very large chocolate-coffee walnut sponge made with 18 eggs and baked in a lined roasting pan for a crowd.

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Course: Cakes & Coffee Cakes

Ingredients Method Notes

Ingredients

18 large eggs, separated
2 cups granulated sugar – 400 g
11 Tbsp potato starch – about 90-95 g
1/4 cup oil – 60 mL
5 Tbsp unsweetened cocoa powder – about 25 g
3 Tbsp prepared coffee – 45 mL
3/4 cup ground walnuts – about 75-85 g

Method

Preheat the oven to 350°F / 175°C. Line a large roasting pan with parchment paper. The original recipe does not give exact pan dimensions.
Place the egg whites in a very large clean mixer bowl and beat on high speed until partially stiff.
Gradually add the sugar and continue beating until the whites are completely stiff and glossy.
In a separate very large bowl, combine the egg yolks, potato starch, oil, cocoa, coffee, and ground walnuts. Beat until evenly mixed and smooth.
Fold the whipped egg whites gently into the yolk mixture in several additions. Do not stir aggressively or knock out the air.
Pour the batter into the lined roasting pan and spread it evenly without pressing down.
Bake for 1 hour, or until the center is set and a long tester comes out clean.
Cool completely before cutting into squares or slices.

Notes

Recipe #218

Yield: One large roaster-pan cake; family-size batch

Category: Cakes & Coffee Cakes

Helpful Notes

This large sponge cake combines cocoa, coffee, oil, and walnuts.
Marked “good” in the family recipe collection.
Use a lined roaster pan; exact dimensions are not specified.
Because this is an unusually large batch, use a very large mixer bowl and do not overfill the baking pan.

Storage

Cool completely before covering. Store according to the type of recipe: baked goods airtight at room temperature unless refrigeration is needed, breads well wrapped, and salads refrigerated promptly. Freeze only when noted or when the finished food is suitable for freezing.

Useful equipment options

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These are optional shopping suggestions for the tasks in this recipe, not a claim that these brands were used or tested. Use equipment you already own when suitable.

OXO Good Grips Silicone Everyday Spatula — Jam — Amazon (paid link)
For folding the whipped egg whites gently into the chocolate-walnut mixture.

OXO Good Grips stainless steel measuring cups and spoons 8-piece set — Amazon (paid link)
For measuring the potato starch, cocoa and coffee.

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