INGREDIENTS
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Cake:
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3/4 pound (3 sticks) unsalted butter, cut into cubes, plus more for greasing
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3/4 cup all-purpose flour, plus more for dusting
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3/4 pound bittersweet chocolate (58 percent cacao), chopped
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1 tsp. instant espresso powder
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1 tsp. kosher salt
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1 1/2 cups sugar
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9 eggs
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2 Tbsp. vanilla extract
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2 cups pecans or walnuts, toasted and finely chopped (optional)
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Ganache:
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1 pound semisweet chocolate, chopped
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2 cups heavy cream
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2 Tbsp. Grand Marnier, Frangelico, or Chambord (optional)