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Preheat the oven to 350°F.
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Thoroughly grease a a 12-cup Bundt pan with vegetable oil spray or softened butter.
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In a double boiler (or a glass bowl over simmering water), melt 5 ounces of the chocolate chips over low heat, stirring constantly.
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Allow the chocolate to cool slightly, about 3 minutes, then whisk in the oil and sugar until smooth, followed by whisking in the egg.
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Add the coffee and buttermilk and whisk until smooth.
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In a separate bowl, combine the flour, cocoa powder, baking soda and salt.
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Combine the dry ingredients into the wet ingredients and whisk until just combined. Do not over mix.
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Pour the batter into the prepared pan and bake in the lower third of the oven for about 45 minutes, or until a toothpick inserted in the center of the cake comes out clean.
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Let the cake cool on a rack for 10-15 minutes, then turn it out and let cool completely.
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In a small saucepan, melt the chocolate, butter and cream on low until smooth.
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Allow to cool for about 4 minutes before pouring it over the cooled cake. I added macadamia nuts for some added color and crunch.
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Be sure to allow the ganache to set for about 30 minutes before cutting and serving.