INGREDIENTS
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1/2 c. unsalted butter, melted and cooled slightly
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2 1/2 c. Milk, warmed
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1 c. flour
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1/2 c. cocoa powder
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4 eggs, separated
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1/8 tsp. white vinegar
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1 1/2 c. granulated sugar
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1 tsp. espresso powder
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1 tsp. vanilla extract
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strawberries, for serving
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Powdered sugar, for dusting