"This tender sponge cake is a base for the classic Boston Cream Pie, but it also makes a terrific layer cake, brushed with flavored syrup and layered with your favorite buttercream...."
INGREDIENTS
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2 oz. (1/4 cup) unsalted butter; more for the pan
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All-purpose flour for the pan
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3-3/4 oz. cake flour (scant 1 cup, spooned into a dry measure)
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7 large eggs, separated
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1 cup granulated sugar
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2 tsp. pure vanilla extract
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1/4 tsp. table salt