INGREDIENTS
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3/4 cup (170 g) unsalted butter, softened
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2 cups (460 g) packed dark brown sugar
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2 teaspoons (10 ml) pure vanilla extract
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3 eggs, at room temperature
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1-3/4 cups (220 g) all-purpose flour
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3/4 cup (90 g) unsweetened Dutch-processed cocoa powder
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1-1/4 teaspoon (7 g) baking soda
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1 teaspoon (5 g) baking powder
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1 teaspoon (10 g) kosher salt
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1-1/2 cup (360 ml) buttermilk, at room temperature
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1/4 cup (59 ml) mayonnaise
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5 large fresh egg whites (150 g)
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1-1/4 cup (250 g) superfine granulated sugar
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1-1/2 cups (340 g) (3 sticks) unsalted butter, softened, cut into cubes
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2 teaspoons (10 ml) pure vanilla extract
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pinch of salt
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5 oz (150 g) quality bittersweet chocolate
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Few drops Strawberry Flavor Oil, or 2 tablespoons (30 ml) strawberry puree
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Few drops pink gel colour