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Martha recreates the iconic dessert from Blum's Bakery in San Francisco. It teams a light sponge cake with rich coffee frosting and crunchy shards of coffee-flavored candy. Martha made this recipe on "Martha Bakes" episode 710.

• 2 1/4 cups cake flour (not self-rising)
• 1 1/2 cups sugar
• 1 tablespoon baking powder
• 1 teaspoon kosher salt
• 1/2 cup vegetable oil
• 6 large eggs, separated
• Zest of 1 lemon
• 1 tablespoon pure vanilla extract
• Coffee Frosting
• Coffee Crunch

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