INGREDIENTS
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For the Cake:
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1 stick (115 g) unsalted butter, softened
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1-1/3 cups (300 g) packed dark brown sugar
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2 teaspoons (10 ml) pure vanilla extract
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2 eggs, at room temperature
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1 cup + 2 tablespoons (145 g) all-purpose flour
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1/2 cup (60 g) Dutch-process dark cocoa powder
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3/4 teaspoon (4 g) baking powder
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3/4 teaspoon (6 g) kosher salt
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3/4 cup (180 ml) buttermilk, shaken and warm
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1/4 cup (60 ml) coffee or espresso
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3 tablespoons (45 ml) mayonnaise
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1/3 cup premium dark or extra dark chocolate chips
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3/4 teaspoon baking soda
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2 teaspoons (10 ml) white vinegar
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For the Vanilla Cream Filling:
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2 tablespoons (30 ml) cold water
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2 teaspoons (10 ml) unflavoured gelatin (such as Knox brand)
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1-3/4 cups (420 ml) whipping cream (35-37% fat), cold, divided
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1/2 cup (63 g) icing sugar
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1 teaspoon (5 ml) pure vanilla extract
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Pinch of salt
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For the Chocolate Glaze:
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6 oz (180 g) premium dark or extra dark chocolate, chopped
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1 stick (115 g) unsalted butter
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1 tablespoon (15 ml) light corn syrup
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Splash of liqueur of choice, optional (grand marnier, spiced rum, kahlua, etc.)
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Pinch of sea salt (regular salt, if necessary)